Filipe Luis
Filipe Luis was one of the best left-backs back in 2014 when he joined Chelsea but was never able to acclimatise to the Premier League and found himself playing second fiddle to Cesar Azpilicueta. As a result, he returned to Atletico Madrid after only a year with the Blues and continued to be a part of the best defensive system in Europe.
Since his departure from Chelsea, the left-back has managed 7 goals and 16 assists in all competition and has won a Europa League title and a European Super Cup. He has twice been named in the La Liga 'team of the season' as well.
Nathan Ake
The centre-back, like many other academy graduates, went out on loan for first-team minutes. But after a successful loan spell at Bournemouth, the Cherries signed him permanently for £20 million. Ake has had a great 2018-19 season with his team playing attractive football.
Chelsea obviously know his potential and, as a result, his Bournemouth contract includes a buy-back clause for the 23-year-old. The Dutch international has featured 88 times for Bournemouth, scoring 8 times and assisting thrice.