Chelsea have already wrapped up a couple of deals ahead of the summer transfer window, with Frank Lampard signing Ajax midfielder Hakim Ziyech, while Timo Werner has also agreed to join from RB Leipzig.
Stoke are desperate to keep hold of the highly-rated striker, who has been capped by Holland at Under-17 level.
The Championship club have offered the youngster a new contract to snub a move to the Premier League.
Sankoh can only pen a scholarship deal until he signs his first professional contract when he turns 17 in October. Chelsea are in pole position to land the forward, they face competition for Sankoh.
Spurs have even offered the forward a contract to head to north London this summer.