Liverpool boss Jürgen Klopp still has no clear idea when Daniel Sturridge will return from his injury lay-off. The 26-year-old striker has been out of action since early December and although he has returned to training, it is not clear when he will make a first-team comeback.

Klopp, 48, admitted the club's medical staff are being cautious with Sturridge, because of his chequered injury past. He conceded, too, that there is no timescale in place for the England player's return.

"His injury history means this (slow progress) is normal. It is not coincidence," he said, according to the Daily Mail. "Some things are not right if you are injured that often. We have to be really sensitive with all the information we get. That is what we try to do. We're trying to find a point from which we can train and build up fitness.

"He could do a lot of sessions in the last few weeks, but they have always been interrupted with different issues where we always have to see and wait on what happens."

The German coach admitted he does not know when Sturridge will next appear in a Liverpool shirt. Liverpool face West Ham United in the fourth round of the FA Cup today (30 January), before they play Claudio Ranieri's table-topping Leicester City side in the Premier League on 2 February.

"I don't know what happens after Leicester, to be honest," the Liverpool boss shared.