Tottenham travel to Stamford Bridge on Sunday knowing a victory over Chelsea will essentially seal off the top four, leaving their London rivals with a huge mountain to climb to better a fifth-placed finish in the Premier League.

A huge part of Mauricio Pochettino's success with the Lilywhites has hinged on his ability to make them an incredibly cohesive unit both on and off the pitch, but he will be more than aware that big games often require something more - a top talent to step up and truly take the match by the scruff of the neck.

So, which player will be key for Tottenham on Sunday, at a ground where they're yet to win in the Premier League? Football FanCast's writers have their say...

Chris McMullan - Heung-min Son

"It has to be Heung-min Son. Spurs have some fabulous players who may be important in this game, not to mention a thorn in Chelsea’s side. But in the absence of Harry Kane, Tottenham’s attack has had to change the way it works. The pace of Son and Dele Alli’s new advanced position provide a new threat, but they’ll have to play very well to pose as big a problem as Kane usually does."

Sam Preston

"It's a toss up between Son and Christian Eriksen but I'll go for Eriksen. If the Dane can get on the ball, he can dictate the tempo of the match and feed Son at will. He scored twice last time out against Swansea so he's enjoying hot form heading into this one. Son will do well to evade the Chelsea back three but he'll be reliant on Eriksen for service."

Mousa Dembele

"Games are often lost and won in midfield and in Mousa Dembele, Tottenham have a player whose ability to completely control his pocket of the engine room is almost unrivalled in the Premier League. Whether he's using his strength to win the ball back or protect it before distributing wisely, the Belgium international has been an unplayable presence for Spurs on a number of the big occasions this season. 

"That gave Tottenham the platform to launch their two-goal comeback from away at Juventus in the Champions League and Pochettino will be hoping Dembele can do the same at Stamford Bridge. If there's one doubt though, it's the special attention N'Golo Kante could pay him. It should be an enthralling battle between the two on Sunday."

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