Union team manager Peter Nowak says he is still searching for the best combination of players as the team prepares for its inaugural MLS season and its March 25 opener at Seattle.

The team is training in Guadalajara, Mexico, where the weather has been as hot as the competition for playing time.

The Union will continue the exhibition portion of their schedule with a session today against the University of Guadalajara. On Sunday, the Union played to a 2-2 draw with Chivas De Guadalajara, a team that plays in the Primera Division de Mexico, the top division in Mexico.

Nowak says nobody should conclude anything from the lineups he has used, especially with more than three weeks to go before the regular-season opener.

"There is no significant first and second team at this point," Nowak said yesterday in a phone interview. "We're looking to find the right combination and see how the young players mix with everybody."

One person who won't be worrying about earning playing time is defender Michael Orozco, who last month was called up to train with the U.S. national team.

He trained with the national team from Feb. 10 to 21 but wasn't included on the roster for its game against El Salvador on Wednesday.

In camp with the Union, Orozco has played center back, defensive midfield, and outside back. He and Danny Califf teamed up at center back Sunday.

"Those two worked very well together," Nowak said. "There is still not 100 percent cohesion, but that is what we are working for."

On Sunday, Jack McInerney had a goal and an assist, but Nowak wasn't ready to single out the 17-year-old forward.

"Not only Jack, but Amobi [Okugo], Danny Mwanga, Toni Stahl, and the other rookies are doing well," Nowak said. "We have a bunch of young kids who need direction and leadership and are getting it from our older players."

Contact staff writer Marc Narducci at 856-779-3225 or mnarducci@phillynews.com.