Peguero, 25, replaces right-handed pitcher Hector Noesi, who was optioned to Tacoma after Wednesday's 4-2 loss to the Baltimore Orioles.
Noesi, 25, was the losing pitcher in Wednesday's game, dropping his record to 2-11. He allowed four runs in five innings. He has lost eight consecutive decisions since May 12, a span of 11 starts.
Peguero was hitting .342 over his last 10 games in Tacoma, with six home runs and 12 RBI. The hot streak pushed his season average to .293, with 18 home runs and 41 RBI in 49 games.
Peguero ranks third in the Pacific Coast League in home runs. He has homered in each of the past five games, including a grand slam Wednesday at Salt Lake. Peguero missed a month of the season (April 8-May 9) after undergoing surgery to repair a torn media meniscus in his right knee.
Peguero made his major-league debut with Seattle last season. He played in 46 games over two stints in the big leagues and hit .196, with six home runs and 19 RBI in 143 at-bats.
The Mariners are looking for someone to ignite their punchless offense. The M's scored just 21 runs in their recently completed 10-game home stand.
Infielder-outfielder Mike Carp, who has been on the 15-day disabled list since June 12 with inflammation in his right shoulder, began his rehabilitation assignment Wednesday with the Tacoma Rainiers.
Carp, 26, was 1-for-5 with an RBI at Salt Lake.
This is Carp's second stint on the disabled list this season because of his right shoulder. He originally injured the shoulder diving on the artificial turf in Seattle's season-opening game against the Oakland A's in Tokyo. He was on the disabled list from March 29-May 1 with a sprained right shoulder.
After being activated from the DL, Carp hit .165 with four home runs in 31 games with the Mariners.
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