Sussex will be without spinner Mushtaq Ahmed for two-to-three weeks after he underwent keyhole surgery on his right knee.
The former Pakistan international went into hospital on Wednesday evening after the county decided to bring forward the operation.
It was originally planned that Mushtaq would go under the knife during the Twenty20 Cup campaign so he would not miss any four-day action.
However, he felt some discomfort during Sunday's Friends Provident Trophy loss to Essex and Sussex have decided to take no risks with their key bowler.
"We made the decision very quickly on the Wednesday morning," Mark Robinson, Sussex's professional cricket manager, said.
"We were originally hoping that we would just play him in four-day cricket up to the Twenty20 window where he'd then have the operation.
"However, on reflection, we felt it wouldn't be right to compromise our strike bowler by having him playing in discomfort, so, with the amount of unsettled weather around and the fact our club surgeon said he could get him in that day, we felt it was the wisest decision to make.
"It is a routine operation that many sportsmen have and we are hopeful that Mushy will be back between two and three weeks."
As well as sitting out Sussex's game with Surrey at Hove, Mushtaq is only expected to miss one other LV County Championship fixture; the trip to his former county Somerset.