Chelsea boss Jose Mourinho says he wasn't expecting striker Diego Costa to play the full 90 minutes against Swansea City.
The Spain international was ruled out of the FA Community Shield that the Blues lost against Arsenal at the start of the month.
But he showed no signs of injury during the hard-fought 2-2 draw against the Swans.
"He did very well and in the second half it was very difficult because there was a big distance [between him and his team-mates], we had one player less and it was a great effort," Mourinho told the club's official website.
"Even so, I was not expecting him to resist for 90 minutes but because we wanted to try to collect a goal we went with him until the end and it was very important for us that he played for 90 minutes with such a physical performance.
"He's very happy with the reaction of his body after such a difficult game.
"For a period we played 4-4-1 and after that we played with Diego and Hazard in attack with three men across midfield.
"In the last part of the game we put Falcao on as a target man with the other two floating behind."