Celtic have been dealt another injury blow with Tom Rogic ruled out of this month's Europa League tie against Valencia. The Australian midfielder is looking at a six-week lay-off with knee ligament damage which he sustained while on international duty at the Asian Cup. Ironically, Rogic returned to Celtic earlier this week with a hand injury which the Parkhead side sent him to London to seek specialist advice, That problem appears to be fine but scans revealed a knee problem which will sideline him now. It comes on the news this week that Filip Benkovic is also out until March at the earliest, while Kieran Tierney also looks highly unlikely to make that one given that he has yet to return to full training with an ongoing hip and pubic injury. "Tom Rogic will be out for about six weeks," confirmed Rodgers. "Tom obviously has come back from the Asian Cup. He did his hand out there, which it was felt didn’t need an operation but he still felt pain in it, and then he got injured in one of the games out there and his knee was a bit sore. "When he returned we had a plan for him to go to London for a scan just to make sure his hand didn’t need an operation. "When he was down there we got a scan on his knee and it ended up that the knee was the one! He’s done his lateral meniscus so he needs an operation next week. That will put him out for about six weeks. And his hand’s ok! There’s always something…”