Cornerback Lemar Parrish has aggravated a pulled hamstring and probably will not play in Saturday's Redskin preseason game at Baltimore, Coach Joe Gibbs said today.

"The leg is a little worse and I don't want to risk having him pull it more," Gibbs said. "It's the type of thing that ususally takes a week to heal." Jeris White will start in Parrish's place.

Defensive end Coy Bacon, who also has missed most practices this week, should be able to perform against the Colts, Gibbs said. Bacon has a sore knee.

Guard Melvin Jones, who has a strained Achilles' tendon, also is doubtful for the game, which means the Redskins will use inexperienced rookie Darryl Grant and newcomer Gary Spivey at Jones' right guard spot.

Gibbs said he intended to have Mike Rae play a third of the game at quarterback. Rae has not appeared in either of the first two preseason contests.

With Ray Waddy sidelined until at least the seventh week of the regular season while he continues rehabilitation from a broken leg, the Redskins still are considering acquiring a fourth cornerback, league sources said today.

The cornerback most likely would come from the waiver list, although the club apparently has conducted some trade talks.

Now that Gibbs seems more happy with reserves Rick Walker and Phil DuBois, the Redskins are less likely to pick up a tight end. One player who had been available, the Jets' Jerome Barkum, has been sidelined with an injury.

Ron Saul and Jerry Scanlan returned to camp today after undergoing knee surgery on Monday. Neither is expected to practice for another week, at least