Chelsea manager Jose Mourinho has admitted his side lack maturity after the Blues suffered a 2-1 defeat at home to FC Basel in their first Champions League fixture of this season.
The Europa League winners took the lead from Oscar's first half goal. However, Basel bounced back as two goals in the final 19 minutes from Mohamed Salah and Marco Streller gave the Swiss club their first win in England.
The former Real Madrid boss returned to Stamford Bridge for his second spell earlier this summer. Mourinho claims his side were nervous after Basel equalised in the second half and is hopeful to avoid facing similar situations in their future matches.
"Of course [it hurts] but I think the team probably is not a team with such maturity and personality to face the difficult moments of the game," Mourinho said after his side's defeat in the Champions League.
"The team started accepting the responsibility of playing, addressing the opponent and trying to create and, when the first negative moment arrived - the equaliser - the team shakes a little bit. But the only thing you can do is work [to correct that]," he added.
Chelsea lost 1-0 to Everton in the league, before their tie against Basel. The defeat against the Toffees saw the Blues have a worst start under Roman Abramovich era as they have seven points after four league games.
The former Real Madrid manager is hopeful to bounce back against Fulham after his side's failure to win in their last four games played in all competitions, losing three in the process.
"Against Everton we played amazingly and they scored in the last second of the half and, after that, you could feel the team was struggling despite dominating the game. This was a bit the same. We go home very sad, the supporters go home very sad but tomorrow we have to go to training and to prepare for the next match," Chelsea manager explained.
"It's the only way I know in football: work hard, believe in what you are doing, believe in each other, be critical inside to try and resolve things inside our group, stick together and try and get a result against Fulham on Saturday that wakes up the team for a smile," Mourinho stressed.