Amir, who is no stranger to T20 cricket having made 50 T20 appearances for Pakistan taking 59 wickets, recently played for Galle Gladiators in the Lanka Premier League where he made six appearances and helped the side reach the final.
The county said it is awaiting clearance from Pakistan Cricket Board for Amir to play for them, and added that "this is expected imminently".
Steve Snell, Gloucestershire Cricket Performance Director, said, "We're delighted to welcome back Mohammad to the squad. He's a proven international performer and to have his experience available to us for the remainder of the Blast tournament will be invaluable. IANS
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