MUMBAI: Kolkata Knight Riders has bolstered its squad by signing up four domestic cricketers -- Debabrata Das and Iresh Saxena from Bengal, Saurashtra?s Chirag Jani and Kerala?s Sanju Samson.

The 25-year-old Das, an aggressive middle-order batsman and a part time wicketkeeper, had represented the franchisee in the 2008 season also.

Saxena (27), who is a left-arm spinner, was an integral part of the Bengal side in all the three versions of the game this season and has also played an instrumental role in Bengal?s triumph in the domestic T20 tournament for the Syed Mushtaq Ali Trophy last season.

Jani, a 22-year-old all-rounder, had a fruitful season for his state this year, averaging 119 with a strike rate of over 100. The 17-year-old Samson has been a part of KKR?s development plans for more than three years and promises to be a good wicketkeeper and a middle-order batsman.