ORLANDO, Fla. — Defender Kevin Alston and captain Shalrie Joseph have been banished from the Revolution’s preseason training camp for disciplinary reasons, according to a team source.

Alston and Joseph both performed during a 2-0 victory over the University of Central Florida Friday night, but they did not accompany the team to yesterday’s practice session.

“They’re not here, that’s all I can say,’’ Revolution vice president of player personnel Michael Burns said.

Asked if Alston and/or Joseph would return to the team, Burns said: “Not for this trip.’’

Alston and Joseph returned to Boston yesterday and could return to training when the Revolution resume practice next week. No fines were announced.

The Revolution will play a practice game against the US Under 17 team today, concluding this trip against FC Dallas Wednesday.

“It’s not ideal, but everyone is professional here and you don’t want any of your teammates not to be here,’’ Revolution coach Steve Nicol said. “But, at the same time, everyone is a good pro and, at the end of the day, you blow the whistle and roll the ball out and you play. That’s the main concern.

“It’s preseason and guys have worked hard to get ready for [today’s] game. A lot of guys are going for a contract and the only thing we have to concentrate on is, we have to decide who’s going to get a contract and who’s not. And we’ve got to try and get some good things out of the game.’’

Joseph missed the opening day of training camp for “personal reasons,’’ according to Nicol. Last year, Joseph was out for five games while participating in Major League Soccer’s behavioral and substance abuse program.

Joseph captained the team against Central Florida, commanding the midfield and scoring the second goal in the 60th minute. Alston started at right back but sustained a hamstring injury and was substituted for after 12 minutes.

“Every year you have to deal with things that are out of your control,’’ goalkeeper Matt Reis said. “As a team, the main thing we have to worry about is the guys who are with us, the guys who are here. We have to prepare for the season.

“It’s very unfortunate, very distracting, something I think could have been avoided. But we have to move on and we can’t stop doing what we’re doing to get ready for the season just because two guys aren’t here. So, we’ll go from there.

“There’s a lot of things you can’t control and we need to worry about the things that we can. It always seems to sort itself out, so I’m not too bothered about that. With the guys that are here, they know what they have to do. Nothing’s changed with what we’re trying to do here.

“We’re just losing two good players and we just have to move on.’’

This is the first time in franchise history the Revolution have disciplined players during preseason workouts by sending them away from camp.

Asked when the captaincy for the season will be decided, Nicol replied: “At the end of the day we’re looking for everyone to step up. I’m a believer that it’s not just one guy who’s captain. We need everyone to step up, that’s what you look for in preseason.

“Absolutely, it’s my call [who will be captain]. The good thing is I can decide when I want.’’

The Revolution will be reinforced by two Central Florida players, midfielder Warren Creavalle and defender Camilo Rendon, for today’s game. French midfielder Ousmane Dabo will not be able to depart from Paris before Monday, so the Revolution expect him to join the team in Boston next week.

Without Joseph, Reis becomes the only Revolution player who has been a member of the team for more than four full seasons. And he remains concerned about the defense.

“One of the things that haunted us last year was inconsistency,’’ Reis said. “I think we still have signs of that. And that’s what we’re trying to get away from, those points in the game where we’re giving teams chances because we’re screwing up.

“Against a college team those things might go unpunished but playing an MLS team, a good team, that’s where we would get punished. We have a long way to go and we’re working on it. We’ve got a month left, plenty of time, we just have to keep moving in the right direction.’’

Frank Dell’Apa can be reached at f_dellapa@globe.com.

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