Chelsea manager Antonio Conte was full of praise for attacking midfielder Oscar after the Brazilian scored two goals against Milan on Wednesday.
Recent reports have claimed that the 24-year-old will leave Stamford Bridge after a very disappointing campaign last season.
But the Italian says all the Chelsea players should share the blame for last season's 10th-place finish.
"Oscar is an important player and I think the season when Chelsea won the title, he played a fantastic season," Conte told reporters.
"Last season was bad for all the players, not only for Oscar or for another player, for all.
"I think Oscar is a good player with a great talent and he can improve a lot. I am seeing in him a good attitude and a good will.
"I think this match told me a lot - about the players who keep and who can go on loan or we can sell. Today, it was important because I have a more clear idea than before.
"Now we go back to London and it's important for me, for the club, to talk and take the decision about all the players. In this pre-season we work with 30 players, four goalkeepers and 26 players. A lot of players.
"Now remains one game against Werder Bremen and then we must take the decision.
"We hope to take the best decision for the club and the players also. The ideas are very clear, but it's important for me to speak about this topic with the club."