LONDON - Didier Drogba looks set to be fit for the second leg of Chelsea’s UEFA Champions League semi-final against Barcelona after training on Sunday.The striker was ruled out of Saturday’s goalless draw at Arsenal with a knee problem he sustained in the first-leg victory over Barcelona.Roberto Di Matteo was not sure whether he would be available for Tuesday’s trip to Camp Nou but the Ivory Coast international has now provided the Blues with a boost by taking part in their latest training session.If Drogba is fully fit for the next match he is likely to come straight back into the side, after proving a handful for the Spaniards at Stamford Bridge.Drogba scored the only goal of the game to give Chelsea a narrow 1-0 lead at the halfway stage of their eagerly-anticipated European tie.Barca are sure to be fired up for the return match and Di Matteo took the decision to rest a number of his key men against Arsenal, with only Petr Cech, John Terry and Gary Cahill keeping their places in the team.Free countryChelsea’s tactics in the first leg received a lot of criticism but Di Matteo insists the defensive display was their only hope of avoiding a drubbing."It is about winning, yes,” he said. "Everybody seems to have an opinion about ourselves. We just have to try to do our job.