Zach Ertz sidelined due to leg injury

Stanford tight end Zach Ertz likely will be sidelined for at least two weeks after suffering a "lower leg" injury on the opening kickoff of Saturday night's thrilling triple overtime win over USC, the school announced.

No. 4 Stanford does not have media access on Mondays, so no further information was available. If two weeks means two games, then Ertz would miss Stanford's Nov. 12 showdown against Oregon (No. 8 BCS, No. 6 AP) in Palo Alto.

In a Twitter posting earlier Monday, Ertz wrote "Everyone has to overcome adversity in life and mine is no different."

After the Cardinal's 56-48 victory Saturday night, he responded to a question via Twitter and said "somebody kinda dove at my knees and then I got rolled up on, nothing too serious."

Ertz is a significant element in Stanford's offensive scheme -- specifically in the three-tight-end formations. After Saturday's game, coach David Shaw said about 25-30 percent of Stanford's playbook involves triple-tight-end sets.

Quarterback Andrew Luck targets Ertz significantly more than his two other tight ends, Coby Fleener and Levine Toilolo. Heading into the USC game, Luck looked to Ertz 31 times, Fleener 21 times and Toilolo 12 times.

Ertz has 22 catches for 308 yards and three touchdowns this season. Of Luck's 23 touchdown passes, 13 have gone to a tight end. Ertz also plays a significant role as a blocker in the run game, has been motioned in and out as a fullback and has split out in the slot and as a wide receiver.

Stanford's ability to use all three of its tight ends on the field at the same time has given them a significant mismatch over opponents this season. Ertz has been Luck's reliable go-to receiver on third downs and in the mid-range passing game, Fleener has been the deep threat and Toilolo is a towering red zone target at 6-foot-8.

The Cardinal visit Oregon State this weekend for their final regular season road game before returning to Palo Alto for three straight home games.

In other Stanford injury news, kicker Jordan Williamson and offensive tackle Cameron Fleming will be evaluated on a day-to-day basis. Punter David Green is expected to return for the Oregon State game. Their injuries were not disclosed and no other injury updates were released.

Kevin Gemmell is ESPN.com's Stanford blogger.