The Tottenham Hotspur attacker has earned over one million new owners ahead of Saturday’s 11:00 BST deadline.
Son is the highest-scoring player in FPL, producing six goals, one assist and 45 points in the first four Gameweeks.
Son also has a prolific record against West Ham, scoring four goals and supplying four assists in his last six meetings with the Hammers in all competitions.
His new owners in FPL may well be tempted to immediately hand the South Korean the captaincy.
Son's team-mate Harry Kane (£10.6m) provides a strong alternative for the armband.
The Spurs forward has netted six goals in his five Premier League home meetings with West Ham, twice scoring a brace.
Callum Wilson (£6.5m) and Bruno Fernandes (£10.5m) are also options as Newcastle United welcome Man Utd to St James’ Park.
Wilson has been involved in all five of the Newcastle goals that have been scored while he has been on the pitch, netting four times and supplying one assist.
He faces a defence who have conceded 11 goals in their three matches so far.
Fernandes, meanwhile, has a fantastic away record since joining Man Utd midway through 2019/20. He has scored or assisted in all eight of his road trips.
Vardy has produced hauls of 13 and 17 points in the Foxes’ first four matches.
Villa playmaker Grealish, meanwhile, has three goals and three assists in the last two Gameweeks.