Ampah has completed a permanent transfer to Championship club Stoke City, signing a deal to 2029.
Joining the Blues aged 10, Ampah developed through our Academy at Cobham. He made his senior debut last season in the Champions League.
“Ato is a player we have watched extensively and, when the opportunity arose to bring him in this month, we acted swiftly,” Stoke Sporting Director Jonathan Walters told the club's website.
“He has a really strong mentality and, as a fast, dynamic winger, he is the type of player who can get you off your seat. He fits the profile of player we want in wide areas for Stoke City.
“At 19, he has significant development ahead of him, and we believe he will only continue to progress within our first team.”
Ampah added: “I am very excited about this new chapter in my career.
“I know the Manager and coaching staff here have a reputation for developing young players and that was a big factor in my decision.
“I am hungry, determined and excited to express myself in front of Stoke City’s supporters.”