Chelsea have signed former Bolton and Sunderland left-back Marcos Alonso for a reported £23m, according to his current club Fiorentina.

The 25-year-old uncapped Spaniard moves to the Premier League for the third time in his career.

He played for Bolton 46 times from 2010 to 2013 before moving to Fiorentina and had a loan spell at Sunderland a year later.

"It's a step up in my career and I think this is the perfect place for me to continue developing. It's time for me to win some titles.

'It was an easy decision for me to make when I heard the club were interested in signing me.

"My family and close friends know Chelsea is the club I have dreamed about playing for so I'm really excited about the challenge and I'm looking forward to working with my new team-mates."