Coach Marc Skinner is “hopeful” that the striker could return for the Pride in one of the team’s next two games.
The Five Stripes were dominated from the opening whistle and fell out of contention for the Eastern Conference’s top seed.
“It can be a spark for our final two regular-season games,” Teal Bunbury said.
The Union battled back from a one-goal deficit to take three points in San Jose on Wednesday.
The forward announced the partnership last week, pledging to raise the money to donate 500 soccer balls by the end of the year.
Valeri might not be a Timber next year, but coach Giovanni Savarese said the club wants him back.
Alejandro Bedoya and Kacper Przybylko scored in the second half to overcome a one-goal deficit.
The Dash couldn’t find the back of the net in their final home game of the 2019 season.
An accidental scorpion kick goal hinted the Timbers’ luck was shifting, but it didn’t last long.
Minnesota United will appear in the MLS Cup playoffs for the first time, thanks to a late score from Hassani Dotson.