Fiorentina have confirmed Marcos Alonso has joined Chelsea.
Standard Sport understands the Blues agreed a fee in the region of £23million for the left-back, who becomes Chelsea's fourth signing of the summer transfer window.
He follows Michy Batshuayi, N'Golo Kante and goalkeeper Eduardo through the doors at Stamford Bridge.
The 25-year-old, who had a previous spell at Bolton, underwent his medical with the club on Wednesday morning and his arrival is expected to spark a flurry of late deals at Stamford Bridge on the final day of the summer window.
Chelsea's frustrating search for defensive reinforcements
A statement on Fiorentina's official website read: "ACF Fiorentina announces that it has sold, outright, to the rights of the player Marcos Alonso Mendoza at Chelsea Football Club."
It comes after the Blues also agreed a £34million fee with PSG to resign former player David Luiz. The Brazilian is travelling to London to undergo a medical with the Blues and discuss personal terms as Antonio Conte reshapes his defence for the new campaign.
