Andy Pettitte is on track to start on Sunday at Yankee Stadium against the Seattle Mariners.
"Everybody's in agreement he's not going to benefit from any more time below," Yankees general manager Brian Cashman said Tuesday.
Pettitte retired after the 2010 season and sat out last year. The lefty, who turns 40 next month, returned to the team in spring training and has been pitching in the minors.
But the plan could shift if rain hangs around, Cashman said.
"We have weather issues all week and reserve the right to change our mind," Cashman said.
The Yankees recently demoted starter Freddy Garcia to the bullpen and Phil Hughes had been struggling until a good start last weekend at Kansas City.
A federal judge sternly chided prosecutors and defense attorneys at the Roger Clemens' perjury trial for going so slowly they were boring jurors.
"Those folk are fed up," U.S. District Judge Reggie B. Walton told the lawyers. "You are boring the jurors. Somebody is going to pay a price for that."
Clemens is being tried on charges he lied to Congress in 2008 when he denied ever having taken performance-enhancing drugs.
Convicted steroids dealer Kirk Radomski took the stand in the afternoon and identified needles and steroids containers found in a crumpled beer can to be products he supplied to Clemens' former trainer Brian McNamee.
The Nationals placed outfielder Jayson Werth on the 15-day disabled list, a day after the rightfielder underwent surgery to repair a broken left wrist. Werth is expected to be out at least 12 weeks.
The Nats also activated third baseman Ryan Zimmerman from the DL. Zimmerman hasn't played since April 20 due to right shoulder inflammation.
Finally in D.C., Washington signed lefthanded reliever Michael Gonzalez, who was 17-21 with 56 saves and a 2.94 ERA in nine seasons with Texas, Baltimore, Atlanta and Pittsburgh, but was unsigned this season.