Speaking to Football Insider, Sky Sports pundit Kevin Campbell has been left concerned for Harry Kane following something he's seen at Tottenham Hotspur when Son Heung-min is absent.

The Lowdown: Spurs suffer blow...

Following the most torrid international break in recent memory for Spurs, the Lilywhites are sweating over star forward Son's fitness ahead of their highly-anticipated clash with Chelsea.

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The South Korea star sustained a calf injury during the break and hasn't been able to feature for Spurs since, with Campbell now dropping a claim involving Kane.

The Latest: Campbell makes Kane and Son claim...

Speaking to FI, the former Premier League striker has claimed that Son's injury could have a very negative impact on Kane after seeing just how much Son's presence benefits the Englishman.

"Kane is in the positions but he is not getting the service.

“When you have a striker as good as Harry Kane up top you have to create.

“Son is a key part of what Harry Kane does because the defence has two things to think about. But when Son is not there the whole defence concentrates on Kane so it makes it harder for him.

"When Son is there the defence is more stretched because he is the runner. It gives Kane more space and time.

“Who is the real threat in behind when Son is not there? There isn’t one. Kane suffers when Son is not there. He is a big absence.”

The Verdict: Spurs sweat...

Taking this and Son's brilliant 2020/2021 season into account, it's safe to say Nuno Espirito Santo will be praying for the 29-year-old's return to action on Sunday.

Indeed, the pair became the most prolific duo in a single Premier League campaign last season.

Amid the Tottenham manager's selection crisis, a return for the star forward could come as a very timely boost indeed - not only to supply quality, but also to free up Kane.

In other news: Levy could now agree blockbuster new deal for another 'magnificent' Spurs player, find out more here.