WASHINGTON -- Manager Jim Riggleman said the team spoke to Adam Dunn about going up to the press box to see broadcaster Bob Uecker in full uniform during Saturday's game against the Brewers.

Dunn, who had the day off that day, went to the radio booth to see Uecker, who returned to work this past weekend after undergoing heart surgery on April 30. The meeting took place in the second inning.

Dunn and Uecker have been great friends since Dunn played for the Reds.

"We have addressed that issue. That's about all I'm going to say about it," Riggleman said. "It's unfortunate."

A baseball source said Dunn was not fined for leaving the dugout during the game, but was scolded by Riggleman and general manager Mike Rizzo. Dunn was basically told not to go to the broadcast booth during a game.

Dunn pushing to remain with Nats long term

WASHINGTON -- Nationals first baseman Adam Dunn said that he would like a four-year deal, but would listen if the team made a three-year offer.

Dunn, a free agent after the season, said he would not want another two-year deal like the one he signed in February 2008, because he does not want to hear his name in trade rumors like it is currently. It was learned that the Yankees, White Sox, Tigers, Rangers and Angels have interested in the left-handed slugger.

"I think four years is what I want. Would I look at three? Yeah," Dunn said. "Do I want another two-year deal? [If I did], I'm in the same situation I'm in now. I don't want that. I want at least a four-year deal, and we can talk about a three."

Dunn said the last time he spoke to agent Greg Genske was Monday night, and Genske gave his client no indication that progress was being made in the negotiations with the Nationals.

"He said he was heading to his little son's baseball game in Cooperstown, [N.Y.]. They have a tournament there," Dunn said. "Apparently, [nothing is going on]."

Asked if he thought it was likely that a deal will get done, Dunn said: "At this point, I really don't know. If you asked me this three months ago, I would have said, 'No doubt.' Now, I don't know."

Dunn continues to say that he wants to stay with the Nationals.

"I like it here and I like the guys here," Dunn said. "Are we playing our best baseball? No. I think in the future this team will not only be good, but great, or I wouldn't be going through all this to just try to stay here. I really want to be here. I like what's going on here. That's why I'm making a conscious effort to stay here."

Walker out for season with torn labrum

WASHINGTON -- Right-hander Tyler Walker announced that he is out for season because of a torn labrum. He will go to Alabama this week to see Dr. James Andrews and get a second opinion.

Walker is expected to have surgery soon thereafter. Walker has had shoulder problems since a June 15 appearance against the Tigers.

During his rehab assignments, Walker said his shoulder grew worse after pitching consecutive games for Triple-A Syracuse.

"Right now, it's still hurting as if I pitched yesterday, and that's almost a week now," Walker said.

Walker pitched in 24 games and had a 3.57 ERA this season.

Zimmermann heads to Harrisburg on rehab

WASHINGTON -- Nationals right-hander Jordan Zimmermann had his worst rehab outing on Monday. While pitching for Class A Hagerstown, Zimmermann pitched five innings and allowed six runs on seven hits against West Virginia.

Manager Jim Riggleman was in attendance and said Zimmermann threw the ball well despite what the stats say.

"I talked to him after the game. He said he really felt good," Riggleman said. "My concern [was] that he felt good. His arm feels good. His delivery looked real good. He didn't get the results yesterday. I know I was encouraged by how his arm felt."

Zimmermann's next start will be in Harrisburg. The Nats are hoping that Zimmermann can return to the Major Leagues sometime in August.