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Celtic fans were left gutted by news of Tom Rogic's knee injury.

Australia's exit at the quarter final stage of the Asian Cup should have meant an early return to club action for the midfielder but now it looks unlikely that he'll be back in action until mid-March.

Before the turn of the year Rogic was at the centre of a tug-of-war with Australia insisting that he joined their Asian Cup squad on December 27th. Celtic had hoped to delay that journey by three days but Aussie boss Graham Arnold dug in, resulting in Rogic missing the Glasgow derby at Ibrox.

Australia weren't in action until January 6th when they lost to Jordan in the opening group match, before seeing off Uzbekistan on penalties in the last 16 and then losing out to the UAE in the last eight.

Celtic have a number of attacking options to deputise for Rogic but the 26-year-old has a great track record for coming up with goals on the big occasion, with a string of important strikes at Hampden Park and in the Glasgow derby.

Rogic joins a growing list of absentees for Celtic's Europa League ties against Valencia that already includes Leigh Griffiths, Filip Benkovic and Dedryck Boyata.

Here's a look at how Celtic fans have reacted to the news on Twitter...