Apr 15, 2007 1:03 AM EST

Manager Bob Melvin will decide after a Monday bullpen session whether Randy Johnson is ready to join the Diamondbacks rotation or needs one more minor league rehabilitation start.

"Right now it's literally 50-50," Melvin said before the Diamondbacks' game against Colorado on Saturday night. Johnson, who underwent back surgery after last season, threw six innings for Triple-A Tucson against Colorado Springs on Friday night. He allowed two earned runs and eight hits, striking out three and walking one.

Via Yahoo.com