The New York Mets designated Michael Tonkin for assignment Monday for the second time this month and activated fellow right-hander Sean Reid-Foley off the 15-day injured list.

The club also called up LHP Josh Walker after it optioned RHP Grant Hartwig to Triple-A Syracuse following Sunday's blowout loss to the Los Angeles Dodgers.

The Mets DFA'd Tonkin, 34, on April 5 before trading him to Minnesota a few days later. The Mets brought him back last week after the Twins DFA'd him on April 13. He is 1-2 with a 6.00 ERA in six relief appearances overall this season.

Reid-Foley, 28, opened the season on the IL with a shoulder impingement. He appeared in eight games with the Mets in 2023 and is 7-10 with a 4.58 ERA in 48 career appearances (13 starts) for Toronto (2018-20) and the Mets.

Hartwig, 26, appeared in two games and had a strikeout in three innings of work.

Walker, 29, appeared in 14 games with the Mets in 2023, going 0-1 with an 8.10 ERA. He's 0-1 with a 2.79 ERA in seven relief appearances at Syracuse this season.

The Mets open a three-game series at San Francisco on Monday night.