Philadelphia ? Now the Philadelphia Eagles have a quarterback controversy.

A disastrous season filled with injuries and the Terrell Owens saga got even worse for the reigning NFC champions following an embarrassing 42-0 loss to the Seattle Seahawks on Monday night.

Mike McMahon, who started his third game for the injured Donovan McNabb, was benched after throwing two interceptions that were returned for touchdowns. Koy Detmer wasn’t much better, throwing two picks and losing a fumble.

Coach Andy Reid hasn’t decided which of the two mediocre quarterbacks will start Sunday when the Eagles (5-7) host the NFC East-leading New York Giants (8-4).

“I want the best guy out there to do the job,” Reid said Tuesday. “That’s where you look No. 1. Who I think can be most effective against the team that you’re playing, I guess you take that into some consideration.”

The Eagles would’ve been better off using Randall Cunningham, who was in town for the retirement of Reggie White’s No. 92 during a halftime ceremony.

McMahon was awful against Seattle. He completed 4 of 10 passes for 61 yards and the two poorly thrown picks. On the first interception, McMahon stared down receiver Greg Lewis and tried to force a pass between two defenders. Andre Dyson stepped in front, picked it off and ran untouched 72 yards for a score.

“I could not tell what happened,” McMahon said.

Rookie linebacker Lofa Tatupu appeared to be the intended receiver when he intercepted McMahon’s pass for L.J. Smith and ran it back 38 yards for a TD in the second quarter.

“He made a really nice play. He kind of squatted a little bit. I tried to stick it in there,” McMahon said.

Overall, McMahon is 37-of-83 for 486 yards, one TD, three interceptions and a passer rating of 52.6. He played one more series after the second interception, before going to the sideline for good.

“Sometimes when things are not going the way you need them to go, you need to make a change and try to get a spark,” McMahon said. “You don’t want to come out of the game. You want to go back in there and do the best you can to get those points back. But, whatever Coach feels is best for the team, you have to believe in that.”