English Premier League giants Manchester City have inserted a 30% sell-on clause in Jeremie Frimpong's transfer to Celtic on the transfer deadline.
The 18-year-old signed a four-year contract in a transfer worth a £1 million.
The Scottish champions have paid an initial £350,000 for Frimpong with the club set to pay the remaining £650,000 in future.
But, Manchester City have managed to insert a 30% percent sell-on clause for the talented teenager.
Frimpong was one of the highly-rated youngsters at the City youth sides but found it hard to break into the senior team.
“I joined Man City as a nine-year-old. I have come a long way but the ride has been amazing," said Frimpong.
“There have been some highs and some lows but I have always given my best for this shirt.
“I feel privileged to have been part of such a club.
“Team-mates, coaches, staff, and fans have always been amazing to me and I will never be able to repay them.
“I came as a boy, leave as a man. Man City will always be in my heart.