Young injured his right shoulder when he ran into a wall during a game against Pittsburgh on April 17. He was hitting .410 with five homers and 13 RBIs in his first 11 games before getting hurt.
Diamondbacks manager Kirk Gibson took advantage of the interleague game to put Young into the lineup at designated hitter, which is only in effect when the game is played in an AL ballpark.
Young will be able to get some at-bats while protecting his shoulder from throwing.
"In all aspects it was a good surprise after last night's game when he told our medical staff he was ready," Gibson said. "He's one of the most important players on the team."
Young played in four games for Class-A Visalia and Triple-A Reno during a rehab assignment, going 4 for 15 with three doubles, a homer and eight RBIs.
"He'll DH today and could play in the field tomorrow," Gibson said.
Pollock was hitting .229 with a homer and four RBIs in 20 games with the Diamondbacks, and Gibson said he thinks "the time he got here will be invaluable."
In other news, Gibson said Daniel Hudson remains on track in his rehab from a right shoulder impingement. He pitched 2 1/3 innings in an extended spring training game Wednesday, and is scheduled to throw a bullpen session on Saturday.
If all goes well on a rehab assignment, Hudson could be back next weekend.
Shortstop Stephen Drew also has been playing in extended spring training games while coming back from a fractured right ankle sustained last July. The hope was that he could begin a rehab assignment soon, though Gibson isn't sure when that will take place.
"He's doing more than he ever has," Gibson said. "Every step he's doing more."