Liverpool boss Jurgen Klopp has pleaded with supporters to put an end to pitch invasions.
There have already been a number of incidents of this kind so far this season, the majority of which have occurred at Anfield.
Speaking in the match programme ahead of Liverpool's 1-0 win over Aston Villa on Saturday, the German said: "Anyone who reads these programme notes regularly will know that I don't need a second invitation to praise our wonderful fans.
"The support they give is second-to-none and I will always be grateful for this.
"But if a good relationship is built on honesty, there is a concern that I have to raise about a problem that has crept in recently. In quite a few games we have had supporters run on the pitch and this is something that needs to stop.
"As a club, we have worked incredibly hard to build a special bond between players and supporters and in the right circumstances I want the interaction between both to be at the highest level.
"The more we can be together, the better - but the pitch itself is an exception to this. We are still in the midst of a pandemic and this means the players spend their times in red zones, doing everything they can to limit contact so that games can be played.
"This precaution is absolutely necessary but it means that the players have to make sacrifices in their own lives to reduce the risk of infection. The pitch is a red zone and needs to be treated that way."
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