Crisp (left pinkie finger) and Ellis (left hamstring) are expected to join the Ports when they play in Lake Elsinore on May 18-20.
Ellis has been stationed at home in Phoenix rehabbing a strained left hamstring, which has kept the A's second baseman off the field since April 20. He also missed time from April 12-18 with the same injury.
Crisp, meanwhile, has yet to make his A's debut since signing a one-year contract in December. The Oakland outfielder was placed on the disabled list April 3 with a fractured finger. He was slated to take batting practice with the club for the first time Wednesday.
"He's had no pain so far," Geren said. "That will be the biggest test yet."