The 38-year-old replaces Afghanistan's Mujeeb ur Rahman who has been recalled by his domestic cricket board.

Hafeez will team up with AB de Villiers as Middlesex's other overseas player after the club last week announced the South African will return for the final two games of the campaign.

He is set to make his debut against Essex at Chelmsford on Wednesday.

"We are delighted to have a player of Mohammad's experience and ability join us for the last few matches of the T20 group campaign," said Middlesex's director of cricket Angus Fraser.

"Attempting to find players to fill the holes created by Mujeeb and AB's departures is difficult, but when contemplating such a figure, Mohammad was top of our list."