Hammersmith and Fulham Police issued a statement saying they are working with both clubs to "deal appropriately with offensive or discriminatory behaviour" as the teams prepare to meet for the first time since a controversial clash in October which saw Blues captain John Terry charged with racially abusing QPR defender Anton Ferdinand. Terry has denied any wrongdoing.
New signing Gary Cahill is trying to keep his focus on the pitch, and said: "I came in on the Tuesday, trained for just a few days before the game at Norwich and then we came straight over on a plane to Mallorca. Training has been really good and it has been enjoyable to get to know the lads - I know everyone a lot better now."
Cahill told www.chelseafc.com: "The trip has definitely helped me.
"I have only been here just over a week, so I've obviously still got to get to know the lads a lot more than I do now, but it's been great because we've spent most of the time together and I've got to know them a lot better than if I was back in England.
"There are a lot of different characters here, definitely - most of all because of all the different nationalities. That's the one thing that's really different here and in that sense it's really good - there are some entertaining characters and they're great guys."
Frank Lampard has been doing some rehabilitation work after suffering a torn calf muscle at Carrow Road last weekend, but is not expected to be included against QPR.
Chelsea manager Andre Villas-Boas, meanwhile, looks to be closing in on Genk's Belgian youngster Kevin De Bruyne, while Shakhtar Donetsk winger Willian has talked up his hopes of moving to London, a potential deal which the Blues boss had played down last week.
Defender Alex appears on the verge of joining Paris St Germain after the Brazilian, now surplus to requirements at Stamford Bridge, failed to agree terms on a switch to QPR.