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Chelsea have signed goalkeeper Asmir Begovic from Premier League rivals Stoke City for an undisclosed fee,

The Bosnia-Hercegovina international joins Chelsea on a four-year deal.

Stoke had hoped to keep the 28-year-old, who had one year remaining on his contract at the Britannia Stadium.

"I have loved my time at Stoke but feel I had to take this opportunity to continue to develop and challenge myself as a player," Begovic said.

Begovic, who joined the Potters is the champions' second signing of the summer following the arrival of Radamel Falcao on a season-long loan.

"I am very happy to be joining Chelsea," said Begovic.

"After speaking at length to the manager, I feel like I can develop here and be an important part of this team. I am looking forward to meeting up with the team on Wednesday for the pre-season tour."

Begovic, who will challenge Thibaut Courtois for the main goalkeeper role, will take the number one shirt left vacant following the sale of Petr Cech to Arsenal.