Yan Couto has revealed the fee Manchester City paid to sign him from Coritiba will double if he plays a certain number of games in five years.
The 17-year-old right-back will join the Premier League side later this year after agreeing to a five-year contract in March.
City agreed to pay the Brazilian side an initial fee of €6 million (£5m/$7m) to land Couto, but they could end up having to pay twice as much if he does enough to make it into the first-team.
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"The clause is to [play] five Champions League or Premier League games in five years," he told Gazeta Do Povo.