However, after undergoing the surgery its been revealed that Sigurdsson is likely to be sidelined until the new year.
"Larus is going to be out for longer than anticipated," Megson told the club's official website.
"When the doctors explored his knee they found it was a bit worse than they first thought and he'll be out for between three and four months.
"You don't want to be losing a player for any length of time, certainly not that amount.
"Larus has started off the season quite well and he's somebody we can ill afford to be without."