Emre Can is determined to prove his value at Liverpool.
His progress was halted after picking up a knock while on Germany Under-21 duty.
"I've worked a lot on my fitness after the injury and I'm doing fine," he told Liverpool's official website.
"I had a couple of problems in pre-season after I joined the club. Then I had two good games for Germany and I picked up the injury.
"I'll get fit again and I'll be stronger but that's all part and parcel of football. I will definitely fight for the club and try to make sure we win every game, as will my team-mates. I'll give 100 per cent.
"I've got to say [the games against Manchester City and Tottenham] were not my best, because I was struggling a bit with a calf problem in both those games and that meant it was difficult to do everything at a high tempo.
"When I'm fully fit again I'll be able to produce better performances. I'm really convinced of that."
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