Hedman, who has been on trial with the club, has signed a contract until the end of the season.

"He (Hedman) will double for Carlo Cudicini and Hilario until Petr Cech returns," the club said in a statement.

Chelsea goalkeper Cech is out for most of the season after suffering a fractured skull in a match last month against Reading.

During the same game at Reading, Chelsea reserve keeper Cudicini suffered concussion following a challenge at a corner.

Cech and Cudicini's injuries led to an unexpected call-up for third-choice keeper Hilario, however Mourinho is keen to have more back-up for the injured Czech international Cech.