Pollard, 35, was a marquee signing for Surrey as one of their two overseas players alongside his compatriot and close friend Sunil Narine, but suffered a knee injury early in their T20 season.
“Despite treatment, he has failed to improve significantly and therefore a decision was taken to gain a surgical opinion,” Surrey said in a statement. “He has undergone successful surgery this [Tuesday] morning which will keep him out of action for the next four to six weeks whilst he rehabilitates.”
Surrey have already qualified for the quarter-finals of the Blast with four group-stage games remaining, with nine wins and a no-result from their first ten fixtures. Pollard made 99 runs in his five innings, with a strike rate of 141.42, and took one wicket and one catch.
“This is hugely frustrating as we have been a dominant force and I felt I was part of something special,” Pollard said. “But I wish the lads all the best for the rest of the campaign whilst I get myself fit and firing again.”
Pollard, who retired from international cricket earlier this year, was a £125,000 signing by London Spirit in the Hundred draft and is expected to return in time to play for them when the tournament starts in early August.