The 23-year-old has been superb since arriving in summer but Tottenham's other forwards are in fine form.
The forward, signed for £22 million this summer according to BBC Sport, is the perfect Mauricio Pochettino player. The South Korean has bags of energy, links up well with his team-mates and can score goals.
The only issue for Tottenham, however, is that, since Son's injury, a number of other forwards have really stepped up their game.
Erik Lamela is suspended for the West Ham United game but, generally, it would be harsh to drop him right now. Should Christian Eriksen be dropped after working so well alongside Harry Kane?
Mousa Dembele, meanwhile, has been phenomenal. Just like Dele Alli getting his chance to shine due to injuries to others, a number of performers have made their case for a starting berth in Son's absence.
So does Pochettino throw Son back into the starting line-up when everyone is fully fit and available? If so, who does he drop?
With Son, Spurs thrashed Manchester City 4-1. Without him, though, the north London side delivered some equally impressive displays. Those mentioned above have all been pivotal.
There will likely be injuries and suspensions at various times that ensure everyone gets their chance. But Tottenham might have a selection dilemma with the South Korean - a good one. Everyone is playing well enough to keep their place!