Chelsea boss Jose Mourinho says striker Diego Costa wants to play again before the curtain comes down on a successful season.
The Spain international suffered a number of hamstring problems during the season and was set to sit out the remainder of the season.
But he might feature again in his attempt to become top scorer in his first year in the English Premier League.
"He wants to play," Mourinho said on Friday.
"I will protect him all the way but he wants to play, so let's find a balance between the risk and the desire to play and try to score a couple of goals."
Asked to give an update on Oscar, Mourinho revealed: "It's [Oscar's injury is] so severe that he doesn't go to the Copa America.
"It's an important injury in the quadriceps which takes it to more than a month.
"It will be six weeks, which takes him out of the Copa America. We spoke with Dunga and he made the normal decision that it's impossible to do it, so he can't go."
The Portuguese also explained that he is very happy with the low number of injuries suffered by his players during this campaign.
"I work like a person who makes suits to measure," he said.
"A player who has played every match in the Premier League needs a different suit than a player who has had five matches, or a player that had no injuries needs different than a player that had injuries.
"This is done by scientific analysis and even more importantly, the eye or the smell of somebody who knows a lot about it.
"So some players had four days off, some players had three days off, some two days and some were working at Cobham on the Monday after the Crystal Palace match.
"This is what we did all season, this is the way we work and it gives results because during the season we had players in great condition, not many injuries and we are very happy with this way of working."
