Antonio Conte conceded that Chelsea are struggling to cope with fighting on several fronts this season after they suffered a shock defeat to Crystal Palace on Saturday.
Chelsea won the Premier League title last season, as Conte enjoyed a brilliant debut campaign in England, but things are not going quite so smoothly this time around.
The champions have already lost three times in the league, with the defeat at Selhurst Park their second in a row and made even more remarkable by Palace's form going into the game.
Roy Hodgson's men had not picked up a point or even scored a goal, but their 2-1 win left Conte's men trailing pacesetters Manchester City by nine points after only eight games.
And the Italian accepts that Chelsea are not finding it easy to play domestically and in Europe, something they did not have to manage last season.
"We mustn't be happy," Conte told reporters. "This season will be very difficult for us.
"For this reason we have to put 150 per cent in; 100 per cent won't be enough. I have players with a great will to work and fight.
"For sure we have to find the strength to overcome this moment. Everyone can see our situation.
"I think every season is different. Last season is the past. Now it is another squad, different players and for this reason if we compare last season we didn't play Europa League or Champions League.
"This season we are facing four competitions and we are having a few problems doing this. When you have a few injuries, you are in trouble."
Back to work today... pic.twitter.com/hlTtSoBZN0— Chelsea FC (@ChelseaFC) October 15, 2017
He added: "You know very well the potential of the other teams but it is important for us to look at ourselves.
"This season will be difficult but also we have to understand we have to try to build something important for the future, to give the opportunity to the new players to have more experience in this league, to give the opportunity to young players to show they deserve to stay and play for Chelsea.
"We must have patience this season to understand it won't be easy."
Michy Batshuayi started in the absence of Alvaro Morata and failed to impress, before reacting angrily to being withdrawn just after the break.
Conte insists he did not see Batshuayi's reaction, but said that such behaviour is to be expected if a player has a "bad performance".
"I didn't see this [reaction]," Conte added. "But it is normal to be angry after a bad performance – but every player had a bad performance.
"I trust in every player and try to give everyone the opportunity to take the chance. But also because we have Morata and then Batshuayi.
"The performance of the whole team was bad. Not one or two players."
|Steelers LB Shazier says he´s ´best linebacker ever´|
|Ranieri: I´ll quit Nantes if offered Italy job|
|Thiem keeps title defence on track, Monfils saves match point in Rio|
|Barcelona are great even without Neymar – Willian|
|Del Potro, Raonic progress at Delray Beach|
|Dolphins place franchise tag on Landry|
|Colts QB Luck ´extremely optimistic´ about shoulder rehab|
|Conte wants to see out Chelsea contract but has bags packed|
|A´s respond to Gruden´s belittling of Oakland|
|Yankees acquire Drury in three-team deal with Diamondbacks, Rays|
|Messi goal will give Barcelona more space at Camp Nou – Suarez|
|Serena Williams: I almost died|
|Conte defends ´incredible´ Christensen after Barcelona error|
|Bayern taking nothing for granted after 5-0 demolition – Heynckes|
|Valverde: Barcelona away goal not definitive for progression|
|Muller & Robben bemoan poor first half despite Bayern rout|
|Ivashka sets up Wawrinka Marseille meeting|
|Chelsea close to a perfect game against Barcelona - Conte|
|Defending for 90 minutes at Barcelona a ´suicide mission´ - Fabregas|
|Championship Review: Villa miss chance to move into promotion places|
|Messi ends his Chelsea hoodoo|
|Texans release all-time leading tackler Brian Cushing|
|Chelsea 1 Barcelona 1: Messi breaks Blues hoodoo to leave tie in the balance|
|Bayern Munich 5 Besiktas 0: Two-goal Muller inspires emphatic win after Vida red|
|Woods and Stricker appointed USA Ryder Cup vice-captains|
|Wales must attack Sexton and Murray - Gatland|
|De Vrij confirms intention to leave Lazio on free transfer|
|Sanchez move down to Champions League frustration at Arsenal - Mourinho|
|Mourinho suggests Pogba is fit to face Sevilla|
|Clinical Kerber strolls past Strycova in Dubai|
|AFC Champions League Review: Hulk & Oscar lead Shanghai, Jeonbuk Motors hit six|
|Cech expects Ospina to start for Arsenal in EFL Cup final|
|Gueye signs new Everton deal until 2022|
|FA charges Man City and Wigan for failing to control players|
|Aguero faces no action over Wigan fan incident|
|Martin released by Buccaneers|
|Las Palmas get green light to sign Viera replacement amid Nasri talk|
|De Kock, De Villiers & Du Plessis looking to Australia Tests|
|FA issues West Ham with anti-doping charge|
|Florenzi a doubt to face Shakhtar, confirms Roma´s Di Francesco|
|Maybe we ´lock him up or tie him up´ – Montella ponders how to stop Sanchez|
|French rugby crisis could last a long time - Magne|
|Pogba and Ibrahimovic train with Man Utd ahead of Sevilla tie|
|Zidane hints at resting Ronaldo for Real Madrid´s trip to Leganes|
|Biggar, Halfpenny and Williams return to Wales´ starting XV|
|Modric adds to Real Madrid injury worries|
|Braehmer pulls out of Super Series semi-final|
|Wolfsburg turn to Labbadia in fight for Bundesliga survival|
|Hales follows Rashid in signing white-ball deal|
|Wigan to investigate pitch invasion after win over Manchester City|
|Drogba ´couldn´t be more proud´ as son signs for Guingamp|
|Stones making no excuses for shock Wigan defeat|
|Bellugi scathing of Inter form and transfer policy|
|Ringrose could make Six Nations impact after comeback|
|Rakitic: I´ve not seen Messi in the gym this often|
|Winter Olympics 2018: Slovenian ice hockey star Jeglic sent home after positive doping test|
|Sevilla v Manchester United: Montella and Mourinho unified in pursuit of identity|
|Besiktas face Bayern test, Messi seeks to end drought - Champions League in Opta numbers|
|Jose Morais: The Mourinho acolyte bringing Barcelona to Barnsley|
|I´ve been bored – Ricciardo itching for start of F1 season|
|Rakitic: More to Chelsea than just Hazard|
|Hosmer agrees to eight-year deal with Padres|
|Cilic untroubled as Fognini battles in Rio|
|Sock, Chung through at Delray Beach|
|Klopp tactics behind my form – Salah|
|Young: Man United can win Champions League|
|Harper refuses to talk free agency, says he´s focused on this season|
|Messi is best but ´not invincible´, says Pedro|
|It´s a red card – Guardiola accepts Delph sending off amid City´s Wigan woe|
|Goffin hopeful of ´fast recovery´ after nasty eye injury|