07:02 AM ET 09.10 | If it's Tuesday, it's tryout day in New York. Anyone who watched David Wilson fumble away his first career NFL start and Da'Rel Scott fail to make a play down the stretch of a 36-31 season-opening loss to the Cowboys realizes the Giants need help at running back. They seem to realize that, too, which is why they will entertain a familiar face, Brandon Jacobs, as well as NFL veteran Willis McGahee on Tuesday for a look-see. Jacobs wants to return to the Giants after spending -- make that: wasting everyone's time -- last season in San Francisco not playing much at all for the 49ers. A source told The Post that Jacobs and McGahee will be at the workout and Joe McKnight, a recent Jets cut, also is expected to attend. The source said no one has been guaranteed that a running back will be signed.