Chelsea boss Jose Mourinho has praised striker Diego Costa after the Spaniard was key to last Saturday's win against Aston Villa.
The 27-year-old was playing his first game since returning from suspension and was one of the best players for the Blues at Stamford Bridge.
He is expected to lead the offensive department in tomorrow's Champions League game away at Dynamo Kiev.
"Of course, we need him," Mourinho told the club's official website.
"The team depends always on a striker like him, from a character, from a personality like him.
"He is a very good player and sometimes personality qualities add something to the team. You always try to find in teams leaders or different kinds of leaders.
"Diego doesn't speak English so well to be fluent and be a leader in the dressing room, but in a game, the way he plays, the way he gives his body to the cause – because his body is always very punished – is brilliant. The team needs that.
"The character, the personality, the movement, the starting pressure (high) up, to stretch the game when the team is under pressure, to stretch the game and to ask for the ball in the space and to let the team come out of the pressure zones.
"He has a lot of tactical qualities that the team needs."