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Featured Image Credit: Twitter/1troggy_FFC
The stadium's new Riverside Side is currently under construction and is scheduled to fully open to supporters in the summer of 2023.
But some fans of the west London club have jokingly urged the Premier League side to tear it down.
That's after a group of builders snuck a Chelsea flag into a hard-to-reach section of the stand.
Just two miles separates Craven Cottage from Chelsea's home ground of Stamford Bridge and the Blues-supporting builders couldn't resist getting one over their neighbours.
In a clip circulating on social media, one of the builders can be seen showing the flag to the camera before tucking it behind some panelling high up in the stadium.
"There you go, for the boys. That's there forever," he said.
"Good luck getting that out," a second builder adds, before another replies: "You're not allowed up here."
The cheeky stunt has angered some Fulham supporters.
"Someone sort this out please," posted one fan on Twitter.
While another joked: "Tear down the bloody stand!"
It is not the first time a fan of a Premier League club has hidden memorabilia of their team in the stadium of a rival.
In 2016, a Manchester United supporter hid the club's shirt and two figurines of Rio Ferdinand and Ryan Giggs at Anfield during the expansion of the stadium's Main Stand.
the 14 true Chelsea fans will always see FFC as rivals, no matter how big they get— 𝗕 𝗢 𝗫 𝗜 𝗡 𝗚 𝘦𝘵𝘤. 🥊 (@BoxingETC) August 10, 2022
I understand it’s been removed now.— Geoff Pruce (@gpruce) August 11, 2022
😂😂😂😂😂😂😂😂— Pat● (@Pathenry97) August 10, 2022
The unnamed United fan told The Sun: "I was working with a load of Scousers and I thought this would be a good way to wind them up.
"It's all just a bit of good-natured banter. There's a lot of nasty things that get said between the two sets of supporters, but I'm not about that.
"The lads I worked with were great, but every time they tested the public address system, I had to listen to You'll Never Walk Alone. I thought I'd leave my own mark on the stadium and remind them who was the best.
"There were quite strict rules about football colours being worn by people working on the stadium, but one day I wore mine under my hi-vis and sneaked it up.
"I had little Giggsy and Rio collectables from a few years ago and they both scored at Anfield in the past so I thought it would be nice to give them a good view of the pitch."