Proteas spinner Tahir signs for Derbyshire

South Africa leg-spinner Imran Tahir has signed for Derbyshire for the bulk of the 2017 season, depending on his international commitments.

Tahir, who is 37 but is ranked the world's number one T20 bowler, will be available from late June in all formats, assuming he is not picked for the Proteas in that time.

Tahir joins Derbyshire after playing for Nottinghamshire last season, and he has also played for Hampshire and Warwickshire in the past.