The Argentine went down under a challenge from Nathanial Clyne and had to be taken to hospital for an MRI scan.
Mancini said: “We don’t know at the moment, we need to wait maybe two days for the scans. We hope it’s not serious but at this stage I don’t know. I am worried, yes. This can happen in every game, it is clear that it is important that you are also lucky through the year but today it’s a problem.
“Usually the knee is always dangerous, this injury was maybe so strange. If it is a serious injury, we will probably change our plans [to bring in a replacement]. Maybe he is out for a week, or three or four weeks, or after the international break.”
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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.