LOS ANGELES -- Tom Gordon's return to action lasted three games.

The veteran reliever was placed back on the 15-day disabled list Monday after straining his left hamstring in the sixth inning of Sunday's game in Milwaukee. Reliever Leo Rosales was called up from Triple-A Reno to take Gordon's spot.

Gordon, 41, was signed as a free agent during the offseason after undergoing elbow surgery in July. He was activated from the disabled list last Monday. He tossed a scoreless inning against the Cubs, struggled Thursday night in Milwaukee and lasted just two batters Sunday before injuring the hamstring while covering home plate following a pitch to the backstop.

"It gives me a little more time now to get things ironed out," said Gordon, who struggled with his command in his last two outings.

Gordon said that if the pain he felt Sunday was a 10, then it was down to a seven Monday.

"They don't think it's more than a Grade 1 [strain]," D-backs manager Bob Melvin said. "It doesn't look to be real significant."

Rosales, who was 1-1 with a 4.20 ERA in 27 relief appearances, lost out in a bid to win a spot in the bullpen this spring. With Reno, he was 2-1 with a 0.90 ERA in eight games.

A native of Los Angeles, Rosales grew up 10 minutes from Dodger Stadium. He figures to have plenty of friends and family in attendance during the series.

The reason for his success at Reno was simple, Rosales said.

"You just have to keep going," he said. "Keep your focus. Not once was my head down."