Oakland Raiders center Jake Grove underwent arthroscopic surgery on his right knee Monday and will likely miss three to four weeks. Grove tore cartilage in his knee in the third quarter of Sunday's 19-13 win against Dallas. With Oakland (1-3) having a bye this weekend, Grove might only miss a couple of games. He will be replaced by Adam Treu, who finished the game against the Cowboys. ``Adam brings a lot more experience,'' coach Norv Turner said Monday. ``I think some of the things that at times have gotten to us, some of the calls in terms of protection and all that, Adam's a lot more comfortable with.''