Former Sri Lanka captain Kumar Sangakkara says he will retire from first-class cricket after this season.

He scored more than 1,000 first-class runs last season, but despite hitting two centuries against Middlesex in county cricket action in England over the weekend, Sangakkara believes September is the right time to end his career in the longer format.

The 39-year-old surrey batsman, who quit test cricket in 2015, is fifth in the list of all-time test run scorers.

Sangakkara who has contracts to honour in Twenty/20 competitions around the world taking him up to 2018 has averaged more than 57 runs across 134 tests, to go along with 11 double centuries at the test level.