Hentgen went 2-8 with a 6.42 ERA in 15 starts this season. He will now work long relief.
"It was a tough decision for me," manager Carlos Tosca said.
"He's such a quality guy. His strength was always to be able to locate. It's just not there. He can't locate."
Hentgen has walked 38 and allowed 82 hits, including 16 homers in 75 2/3 innings. The 1996 Cy Young Award Winner wasn't surprised by the move.
"I didn't have a real good first half," Hentgen said. "This
is a business. The best players should be on the field. I'll try to
continue to grind and get better."
Hentgen underwent elbow ligament replacement surgery in August 2001. He went 7-8 for Baltimore last season, but was 6-3 with a 3.10 ERA in 13 starts after the All-Star break.
The Blue Jays plan to call up a minor league pitcher to take
Hentgen's spot in the rotation Friday against Montreal in Puerto
Rico. The move is expected to be announced Thursday.