The absence of midfielder John Obi Mikel leaves Chelsea boss Jose Mourinho with an injury crisis to contend with, ahead of Sunday's FA Cup final clash against Manchester United. The 20-year-old Nigerian picked up a hamstring injury in Chelsea's weekend 1-1 draw with Everton in the Premiership final day. "Mikel is out of the game, we will see but I think he is out of the game, and in this moment I have 15 players in the final, exactly 15," Mourinho told Chelsea TV. "Maybe if Ash (Ashley Cole) is ready we have 15," Chelsea will have to go to the new Wembley Stadium without Andriy Shevchenko, Michael Ballack, Arjen Robben and Ricardo Carvalho as well. Mourinho's short options in attack keep him in possession of just a couple of strikers which are Ivorian duo Didier Drogba and Salomon Kalou. The situation could force the Portugeuse tactician to make an outrageous move by giving reserve goalkeeper Hilario a backup striker role. "I have to choose between Hilario - because he is not bad playing forward - or bring a one of the kids to make 16," added Mourinho.