Mohammed Kudus can expect a hostile welcome when he steps onto the London Stadium turf in the colours of Tottenham Hotspur.
Precious few players have made the cross-London transfer from West Ham to Spurs over the years. While the animosity between the clubs doesn't quite match the intensity of the north London derby, it's certainly not one for the faint-hearted.
Scott Parker discovered that first-hand after making the identical switch to Kudus, who joined Spurs for £55million in July, back in 2011. Parker had been adored by the Hammers faithful during his four campaigns at Upton Park, earning 'Hammer of the year' honours on three occasions.
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He also claimed the Football Writers' Association player of the year award despite playing for the Hammers side that finished bottom of the Premier League in 2011. Worried about losing his spot in the England squad for Euro 2012, relegation prompted Parker to look for a new club and he signed for Spurs for £6million.
He said at the time: "Playing in the Euros was a massive factor. The last six months for me has been massive with England. I have not just been getting into squads, I have been playing. To get into the squad for the Euros would be massive for me and my career.
"I want to do everything I possibly can to get into that squad really. With the way it's gone for me over the last year, I felt like I needed to be playing in the Premier League."

However, his hopes that West Ham supporters would have respected his reasons for leaving the club were quickly dashed when he returned to Upton Park with Spurs in 2013. Parker, who conceded a penalty in Spurs' 3-2 victory, was left stung after being booed.
He said: "I didn't expect the West Ham fans to boo me and obviously it was a little bit upsetting.
"I don't know why [they did it]. I don't know if it's because I went to their local rivals... I'm not sure, but I just would have liked to think that maybe I would have got a better reception after what I did in my time here.

"I loved [Upton Park], the fans, and I loved the club. I had four fantastic years here and it will always be a club with a massive place in my heart. I was looking forward to coming back and I couldn't wait to go out there and play, so I was disappointed [to be booed]."
Parker and Kudus are two of just six players to have switched from West Ham to Spurs since 2003. The others were Michael Carrick, Jermain Defoe, Frederick Kanoute and goalkeeper Jimmy Walker.
West Ham and Spurs clash in Saturday's 5.30pm kick-off. Amid unrest off the pitch, Hammers supporters will be demanding a reaction after watching their team get demolished 5-1 by Chelsea in their last home fixture. Meanwhile, Spurs are seeking to capitalise on an encouraging start to the campaign under new boss Thomas Frank.
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