Chelsea are set to be without star striker Diego Costa for Sunday's trip to Arsenal after he failed to recover in time from a hamstring injury. Blues manager Jose Mourinho said on Friday that he would make a late decision on Costa’s fitness, but his leading scorer is not in a condition to play at the Emirates Stadium. Costa suffered the latest in a string of hamstring injuries against Stoke City three weeks ago but Chelsea are wary of risking him while they hold a comfortable lead in the Barclays Premier League. Costa has not featured for Chelsea since going off injured against Stoke on April 4 . Costa is not even likely to be named on the bench for Chelsea at the Emirates on Sunday . The Spain striker is unlikely to even make the bench for Sunday’s top-of-the-table clash and he could also miss the potential title clincher at Leicester City on Wednesday night. Mourinho confessed on Friday that Loic Remy was not ready to return from an injury suffered in training two weeks ago, leaving Didier Drogba as the only senior striker available to him. The Chelsea manager had hoped that Costa would be able to train with the rest of the squad this week but his participation has been limited by his injury. Chelsea’s 17-year-old forward Dominic Solanke – who has played just 17 minutes for the first team - will deputise on the bench. Loic Remy is also out of the match leaving Didier Drogba as Chelsea's only fit senior striker . The young hitman has scored 35 goals at youth level this season but was left out of the Under 21 side’s 3-0 win over Everton on Thursday. ‘Didier for sure is fine, Remy is out for sure and with Diego we will make a decision tomorrow,’ Mourinho said on Friday. ‘Diego is a very important player for us but the reality is we are coping with the difficulty of every match without him. Chelsea's 17-year-old striker Dominic Solanke (centre) is set to be named on the bench . ‘The team is adapting to play in a different way. In the last period we are more strategic and less artistic but we are getting results.’ Chelsea are 10 points clear in the Premier League title race and wins against Arsenal and Leicester would see them crowned champions before the end of April. Costa has been sidelined four times this season with his hamstrings, which also gave him trouble at the tail end of his last campaign with Atletico Madrid.
Chelsea face Arsenal at the Emirates on Sunday in the Premier League .
Jose Mourinho said on Friday that Diego Costa will face late fitness test .
Spain international is set to miss the game with a hamstring injury .
Loic Remy also out of the clash with Dominic Solanke likely to be in squad .