Chelsea boss Andre Villas-Boas concedes that Didier Drogba's future is up in the air as the wrangle over his new contract at Stamford Bridge continues.GettyImagesAndre Villas-Boas has yet to hand Didier Drogba a league start this season• Drogba set to extend contractDrogba's current deal expires at the end of the season and, after being presented with a one-year extension, he returned with a counter-offer, the details of which are unknown.And Villas-Boas, who introduced Drogba off the bench as Chelsea beat West Brom 2-1 on Saturday, admits negotiations with the Ivory Coast striker have stalled."I don't know what is happening," the Portuguese told the Daily Star on Sunday. "Didier knows about our offers and he has made a counter-offer and we are