Washington Nationals Manager Frank Robinson recently fined outfielders Jose Guillen and Brad Wilkerson for on-field transgressions, both players said yesterday.

Guillen said he was fined for not running out a pop fly, and Wilkerson was fined for missing a sign. Guillen declined to name the amount; Wilkerson said his was $500.

Robinson said he wanted such matters to "stay in the clubhouse." But neither Guillen nor Wilkerson said they had any problem with the fines.

"He should do that," Guillen said. "He's the manager. I should run. If I don't, he should make sure I remember."

Wilkerson said he looked up late and missed a bunt sign, and on the team's trip to the West Coast early last month, Robinson became frustrated that the team missed a few signs in a game, and said he would institute fines if it happened again.

Carroll Sits, Nitkowski Demoted

Second baseman Jamey Carroll sat out last night's game with a slightly sprained left ankle, and his injury -- coupled with the shaky performance of left-handed reliever C.J. Nitkowski -- led to the Nationals making a move after the 7-2 victory over Oakland.

The Nationals sent Nitkowski outright to Class AAA New Orleans -- though he said after the game that he hadn't decided whether he would report -- and called up 32-year-old utility man Rick Short, who will finally get a chance in the big leagues after collecting 1,235 hits in the minors. Short was hitting .341 with 30 RBI in New Orleans.

Carroll, meanwhile, said he likely could return today. Carlos Baerga started in his place. . . .

Left-hander Joey Eischen, on the 60-day disabled list with a broken right arm, threw 30 pitches in the bullpen. "I'm happy with the way everything felt," he said. Eischen will throw live batting practice on next week's trip in Anaheim and Texas. . . .

The Nationals introduced first-round draft pick Ryan Zimmerman prior to last night's game. He officially signed his contract, for a $2.975 million bonus, and will likely report to Class AA Harrisburg sometime next week.