Martinez leaves Villa after six years at the club, having played a key role in their rise up the Premier League and their recent European success.
Chelsea have completed the signing of Argentina World Cup winner Emiliano Martinez from Aston Villa.
The 33-year-old has signed a three-year contract at Stamford Bridge after the clubs agreed a reported £7.5 million deal.
The Golden Glove winner is expected to challenge for the number one spot this season, as well as bringing a wealth of experience.
Martinez leaves Villa after six years at the club, having played a key role in their rise up the Premier League and their recent European success.

Wales Stun All Blacks To End 73-Year Wait For Victory
Ireland Face Must-Win Kosovo Clash After Narrow Defeat To Austria
Kildare Trio Feature As Ireland Overcome Fiji In Nations Championship
Kildare's Sean O'Haire Kicks Dramatic Last-Minute Winner In American College Football
Sunday Morning Sports Update
Milltown Through To Leinster Intermediate Semi-Finals After Victory Over Meath Champions
Sarsfields Leinster Championship Campaign Ends After Heavy Defeat To Cuala
More Than 20 Horses Withdrawn At Cheltenham Over Ground Conditions