According to this article from the Chicago Sun Times, it looks like he is on a 90 pitch pitch count.
Long wait's finally over: Prior to pitch today
June 18, 2006
BY TONI GINNETTI Staff Reporter
Good news comes in different doses for the Cubs, so the official return of Mark Prior to the rotation today is strong medicine.
After three months recovering and rehabbing from a strained muscle in his right shoulder, the Cubs and Prior hope his start against the Detroit Tigers today is the beginning of a healthy run through the remainder of the season.
"It's been a long, hard road,'' manager Dusty Baker said. "I'm glad Mark's getting on the mound again, and hopefully we'll keep him there.''
Prior pushed to make his return instead of one more rehab start after pitching two games for Class A Peoria and one each for Class AA West Tenn and Class AAA Iowa. In his last outing for Iowa five days ago, he threw 90 pitches in working 62/3 innings, allowing one run and four hits with 10 strikeouts and one walk.
"His side [session Friday] was good, and he's recovered well after his last outing,'' pitching coach Larry Rothschild said. "It's time to go.''
Prior, 25, will be on a pitch count of about 90, "and hopefully that's deep in the game,'' Rothschild said. The 6-5 right-hander will be returning from his sixth stay on the disabled list in the last four years, though three weren't because of pitching-related injuries.
The team expects Prior's return to be steadier than that of Kerry Wood, who is coming back from shoulder surgery. Wood was activated, but he made only four starts before going back on the disabled list with shoulder stiffness June 7.
"Surgery is completely different from what Mark's been through,'' Rothschild said. "He's been on a pretty steady workload schedule. We knew with Kerry there would be times when it would be touch-and-go because of the surgery, so it's a little different.''
Prior missed the start of last season with right-elbow inflammation, but he was on the roster by April 12. His return was interrupted again May 25 when he was struck in the right arm by a line drive, an incident that could have cost him his career. But he returned in late June and made 27 starts during the season, going 11-7 with a 3.67 ERA.
In 2004, Achilles tendinitis delayed the start of his season. Prior made 21 starts that season, going 6-4 with a 4.02 ERA.
In 2003, his best season and the year the Cubs won the National League Central, Prior made 30 starts and was 18-6 with a 2.43 ERA despite missing time just before the All-Star break after a baseline collision with the Atlanta Braves' Marcus Giles. It cost Prior a chance to pitch in the All-Star Game, though he was selected to the National League team.
"He's had two freak accidents that people forget,'' Baker said. "People were saying he was going to have everything from Tommy John [elbow surgery] to shoulder surgery.
''You can't listen to what people say. He's still here in one piece and hasn't had any of those [surgeries].''
Prior's successes in returning after injuries could be a confidence boost for him now, Rothschild said.
"It should put him in a good frame of mind,'' Rothschild said. "I've watched a lot of these, unfortunately. You look for effort and things that can help him get through it. During a game, there's not a lot you can do but just try to carry out the preparation of before the game, then watch at what point he might tire.''
Prior's activation will require a corresponding roster move, which will be announced today.
tginnetti@suntimes.com