New England Patriots tight end Rob Gronkowski had surgery on his broken forearm Monday, according to ESPN.com.
The team is not sure how long Gronkowski will be out, but a source told ESPN that he will miss "probably a few weeks."
Gronkowski said Sunday night that it would be four to six weeks, which could put him out for the remainder of the regular season.
The tight end broke the forearm during an extra point with 3:55 left of the Patriots' 59-24 blowout over the Indianapolis Colts on Sunday.
"I knew he had gotten injured, but I obviously didn't know the extent," quarterback Tom Brady said on Boston radio station WEEI on Monday. "But he's such a great player, it (stinks) that he gets hurt, but it's part of this game. He's got to do his best to get back as soon as possible, and we've got to go out there and win some games without him."
Gronkowski had seven catches for 137 yards with two touchdowns against the Colts. For the season, he has 53 catches for 748 yards with 10 touchdowns in 10 games.
New England is waiting for tight end Aaron Hernandez to return from an ankle injury. He has missed six games so far.
The Patriots also have veteran tight ends Visanthe Shiancoe, Daniel Fells and Michael Hoomanawanui.
Gronkowski had 90 receptions for 1,327 yards with a tight end-record 17 touchdowns last year.
The Patriots visit the New York Jets on Thursday night.