Chelsea are becoming increasingly concerned about their fans' behaviour ahead of their derby with Spurs on Bank Holiday Monday.
One complaint has already been made about anti-Semitic comments on social media by Chelsea fans. Spurs have historic links to the Jewish community in north London.
Previous fixtures between the two sides have seen trouble of that nature, and the fact that the game will take place on a day when many fans will be off work has led the Blues to appeal to their fans.
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The derby will have added importance this season as although Chelsea have little to play for following a season of mediocrity, they are still looking to play some part in the title race by putting Spurs' league ambitions completely out of reach once and for all. Spurs, meanwhile, need a win to cement second place and ensure they finish above Arsenal.
Fans could risk bans
A Chelsea spokesperson, quoted in the Daily Mail, said: "While we understand the emotions involved in this long-standing local derby, we believe both sets of supporters should get behind their teams in a passionate but respectful manner."
The game was originally moved to the Bank Holiday so that it could be televised, but that decision is under the spotlight because of the concerns raised about fans' behaviour.
Chelsea have warned that fans caught taunting Spurs with anti-Semitic abuse risk being banned from Stamford Bridge and potentially arrested.
There is expected to be a heavy police presence at the game, though that was also the case at Spurs' north London derby with Arsenal last month, when trouble ensued regardless.
Do you think Chelsea should take extra precautions for the game? Have your say in the comments.