Kylian Mbappe had a clause in his contract that could have prevented him from joining PSG after his season on loan.Mbappe joined PSG in the summer of 2017 after impressing for Ligue 1 rivals Monaco.He initially joined on loan, with a mandatory fee of around £156 million at the start of the next campaign - making him the most expensive teenager ever.Ferrer said: "The first year there was no transfer, but a loan, although there was a clause that the purchase was mandatory – unless there was a decline in performances," during a recent interview with Goal.Mbappe had burst onto the scene as part of a free-scoring Monaco that reached the semi-finals of the Champions League: knocking out Manchester City and Borussia Dortmund along the way.The side.
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