"Coming off of a 6-2 win [at Los Angeles last week] when guys are firing on all cylinders, a lot of times you want there to be a game very shortly afterwards so you can build that momentum," Petke said. "But the good thing, like I said, is during the last today included four days, we have not seen a dip in mentality, form, or anything.
"They've really taken that game and are starting to run with it, and knowing now what we're really capable of when, a) they listen, and b) when they put everything out there on the field."
As he would have in preseason, Petke has used the past week to fully implement new concepts, especially the ones that worked well for RSL in the Galaxy game.
One of those adjustments was pushing outside backs Tony Beltran and Demar Phillips up.
"It gives more attacking options," center back Justen Glad said. "It kind of opens the game up, and really if the center backs can hold it down it helps a lot."
Before heading to Portland, RSL will get to test its new tactics in an exhibition match with Manchester United at Rio Tinto Stadium at 8 p.m. Monday.
Brooks Lennon, the 19-year-old homegrown player, who sprained his ankle in training last Friday, was cleared to jog Tuesday.
"Brooks is like my 12-year-old," Petke said, "he could have a broken leg and he wants to run around. Which is great, you want that eagerness and that desire from a player, but he hasn't done any cutting yet or certain game movements. But from a running standpoint it's great to see him already running around, and the quicker we have him back in, the better we're going to be."
According to Petke, they still do not have a timetable for Lennon's return.
More ankle injuries
In the past two weeks three RSL players, including Lennon, have suffered ankle injuries.
Forward Ricardo Velazco was carried off the field at training Tuesday with a right ankle injury. The exact injury had not yet been diagnosed by the afternoon, per RSL communications.
Before last week's game at L.A., goalkeeper Matt Van Oekel suffered a high ankle sprain. There is no timetable for his return either, Petke said.
"We can't even seem to get through a practice healthy," defender Chris Wingert said. "Yet again, it's just not something you can concern yourself too much with as the individual player. You've just got to come and try to bring it every day, and if you do get injured just do everything you can to get back on the field.
"And that's one thing I'll say for the guys is, yeah we've had a bunch of injuries, but they're working their tails off in the training room to try to get healthy. And hopefully we can get as many guys back as possible and just keep pushing forward for the rest of the season."
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Manchester United at RSL
Monday, 8 p.m.
TV • ESPN2