Holmes (fibula) is tentatively scheduled to make his first minor-league rehab start Thursday, MLB.com reports.
Holmes had been slated to begin his rehab assignment this past Saturday with High-A Brooklyn, but as a result of rainy conditions, he instead opted for a 45-pitch bullpen session. The right-hander will look to build on that pitch count Thursday, and if all goes well, he could make his return from the 60-day injured list as soon as July 28. Holmes likely won't be stretched out enough to handle a typical starter's workload immediately upon his activation, but the Mets may be eager to showcase him to potential suitors ahead of the Aug. 3 trade deadline.