Hearts hope Fraser Mullen will make Scottish Communities League Cup final despite the right-back suffering an ankle injury in Sunday's Edinburgh Derby. The teenager had to limp off in the first half of the game after putting in a strong sliding tackle on Hibs winger Matt Done.Hearts interim manager Gary Locke said: "He's got a bad one. We'll see how he responds to treatment. I'm hopeful that he'll be okay but he is in the hands of the physios at the moment. If they can work their magic then hopefully he will be in contention but it's still too early to say at the moment."Locke is already worried about defenders Danny Grainger (knee), Jamie Hamill (knee) and Marius Zaliukas (ankle) who are on the injury list. However, Darren Barr will be free from suspension to join the squad to face St Mirren on Sunday.