The Athletics have shut Lopez down from throwing due to a Grade 1 flexor strain in his left arm, Martin Gallegos of MLB.com reports.

EDGE Analysis

Lopez tossed just 65 pitches in his start against the Mariners on Sunday, giving up nine earned runs on six hits and six walks while striking out two across two innings. Manager Mark Kotsay noted Monday that a roster move will be made Tuesday to officially add Lopez to the 15-day injured list, though the club is hopeful that he'll be able to return at some point before the end of the season, even if it means he's working in a bullpen role, according to Gallegos. Joey Estes and Osvaldo Bido will be candidates to enter the Athletics' rotation in Lopez's absence.