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Left-Back: Marcos Alonso (Chelsea)
Signed for: £24m in 2016
Current Market Value: £36m
Not many will remember that this Chelsea is actually Alonso's third club in the Premier League. A product of the Real Madrid youth academy, Alonso played for Bolton Wanderers and also had a loan spell at Sunderland when he was contracted to Fiorentina.
But when the Blues came calling with a £24m bid, he decided to return to England. Since then, he became an integral part of Antonio Conte's system as a wing-back and became the best in his position in the league.
Six goals in his first season in the league, followed by seven last season, there was no better goalscoring defender. Now, under Maurizio Sarri, he has moved to left-back but continues to score and create opportunities.
Although there are deficiencies in his defending, he is still the most valuable left-back in the Premier League at the moment.
