Bassitt (back) underwent a minor procedure to have bone spurs removed from his back, Jake Rill of MLB.com reports.
Bassitt was placed on the injured list June 8 with low-back discomfort, and his return to the major-league mound will be delayed after undergoing the back procedure. General manager Mike Elias said that the team will see where the 37-year-old stands in his recovery in a "couple weeks" before he potentially throws again, so Bassitt is a safe bet to be sidelined through into late July, at least.