According to the 'Daily Mail', the 'Blues' have included a buy-back clause and 15% sell on fee percentage as part of Bertand Traore's £15m move to Lyon. clauses such as these ensure that clubs can continue to profit financially from their young talent, even after they have left the club.
The Londoners are keen to avoid another situation similar to that of Romelu Lukaku, Chelsea allowed the Belgian to join Everton permanently in 2014 for a fee of £28m, however his significant development since has seen Antonio Conte's side show an interest in re-signing the 24-year-old, only to be quoted a world-record £100m.
Buy-back clauses are an excellent way of avoiding this problem, with the 'Daily Mail' also reporting that Chelsea are looking to include one in any potential sale of Nathan Ake, with Bournemouth thought to be pushing hard to secure his services.
Buy-back clauses have been a common sight in Spanish football for years now, with Barcelona set to invoke Gerard Deulofeu's in the coming days, and it seems as if they may finally be making the jump to the Premier League.