De La Rosa will throw a bullpen session during Tuesday's workout at Citizens Bank Park. At that point, a determination could be made whether he'll be available for Game 3 or 4 back at Coors Field next weekend.
Tracy said Ubaldo Jimenez will start Game 1 Wednesday afternoon.
He didn't say it, but Aaron Cook will start Game 2 Thursday afternoon.
After that it could be De La Rosa, it could be Marquis or it could even be Jose Contreras, although Tracy has indicated he'd like to have him as an option in the bullpen.
Not surprisingly, Tracy said his team must keep Jimmy Rollins and Shane Victorino off base and keep Ryan Howard, Jayson Werth in the park if they want to advance.
"There are two big keys in my opinion competing against them. One is doing the very best job you can do controlling the top of their order. And trying to hold the big guys in the middle at bay as best you can. Because if you don't do things that way, they have the capability of putting big numbers up. And that would be bad," he said.
Given the Phillies well-documented bullpen worries, the early innings of these first-round games could be even more important than usual.
The Phillies would hope to build a big lead, taking the pressure off the relievers.
The Rockies believe if they can stay close or go ahead, they would have the edge.
"We're very encouraged about what we have to offer from a bullpen standpoint," Tracy said. "We're very encouraged where we're at. We've got a healthy Huston Street. We've got Rafael Betancourt, who has been doing a tremendous job for us since he arrived. If we can get to the back end of the game with a lead, we've got lefthanded situation guys who can do some things. We're solid down there. The back end of our bullpen has been pretty special for a long period of time.
"We can get six or seven outs to win a game if we need to."
In the end game, the Rockies have some situational lefthanders they can call on including Franklin Morales, Joe Beimel and Randy Flores.
Morales has had an interesting year. He was 6-for-6 in save opportunities when Street (34-for-36) was sidelined earlier this season. More recently, though, he's had trouble throwing strikes. In his last nine appearances he walked eight in 4 1/3 innings and had a 20.77 earned run average.
"He's a young kid and there are going to be peaks and valleys with a young kid. When he's throwing the ball well, good luck [trying to hit him]. And we have seen that. He's given us more than just a glimpse of that," Tracy said.
The Phillies, on the other hand, will hope to exploit the Rockies struggles this season against lefthanded starters. They were just 27-26 this year when a lefty started against them.
The Phillies are all but certain to start Cliff Lee and Cole Hamels in the first two games and still could keep J.A. Happ in the rotation as well.
The Rockies were 15 1/2 games out of first place on June 3. Until they lost Saturday night, they had a chance to finish with the best record in the National League. That's a pretty good indication of how hot they've been lately.
The Phillies are the defending world champions and have almost all of their key pieces back plus Raul Ibanez, Cliff Lee and Pedro Martinez.
The regular season, finally, is over. The National League Division Series begins Wednesday. *