The Scotland international sustained the injury taking a goalkick in last weekend's goalless Premier League draw at West Ham. The club initially thought the problem was tendinitis but manager Ian Holloway confirmed on Thursday the injury was worse than feared. Holloway said: "He's got a cracked patella, which is your kneecap. "If you can believe it he did it taking a goalkick but played on for 20 minutes until half-time. "We knew it was sore but, gracious me, how brave is Matt? "It's bad news. He is going to have to have it wired up and pinned up to get better and it could take a couple of months." Gilks' absence means Ghana international Richard Kingson will continue for Saturday's clash against Wolves. Paul Rachubka is ineligible, even though fit, as he was not named in the 25-man squad at the start of the season due to a knee injury. The club had expected the former Manchester United trainee to be out until January. As back-up, 20-year-old Mark Halstead has been recalled from a loan spell at Barrow he only began last week. Gilks, 28, will be in hospital this week for his operation. Holloway added: "Such is life. Everything was rosy for him but all of a sudden - bang, welcome to the real world. "But he's going to be fine. It's not life-threatening, he's not maimed." In a further blow, midfielder Charlie Adam is unlikely to face Wolves at Bloomfield Road after suffering medial ligament damage on international duty. Adam, 25, played for 55 minutes in Scotland's 3-0 victory over the Faroe Islands on Tuesday. Holloway said: "I don't think he is going to be available, he couldn't train this morning. "But we will leave it right until the last minute Saturday morning. "It is not as serious as they thought it was in the Scotland set-up but it does feel a little more sore today."
