COMMERCE CITY — When Colorado Rapids midfielder Marco Pappa injured his left knee in a 2-1 win over the New York Red Bulls on April 16, the prognosis was two to four weeks with a sprained MCL.

“Four weeks later, we make an MRI again, and we see it had a bone bruise,” Pappa said Wednesday. “The bone is still healing, so not sure how long it will take.”

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His knee is improving, but Pappa said it is still not 100 percent. The 28-year-old playmaker has been doing work off to the side at training and rehabbing it on his own.

“It’s just day-to-day with Marco,” Rapids assistant coach John Spencer said Wednesday. “We have to be careful we don’t rush him back too quickly and get any setbacks.”

Colorado is set to face Eastern Conference-leading Philadelphia Union on Saturday at Dick’s Sporting Goods Park, but after that, its next MLS match isn’t until June 18, which would give Pappa more time to make sure he’s 100 percent.

Pappa said he was unsure if he’d be ready to play Saturday.

“I was targeting for many games before and didn’t make it,” Pappa said. “So for now my mind is: Try and be good, feel healthy and be 100 percent. That’s my goal.”

The Rapids are 4-0-2 in the six games since Pappa’s injury. He said he’s happy to see the team’s success but naturally would prefer to be on the field.

“He’s a wonderful footballer,” Spencer said. “One of the best No. 10s in the league. So it’s important we get him back, fit and healthy and ready to play.”