Sources told ESPN.com on Sunday night that Thomas will soon be joining San Antonio on a D-League callup from the L.A. D-Fenders after Boris Diaw's fine start to the season with the Spurs was interrupted this week by a rib contusion and then a dislocated finger.
Thomas, who played with Leonard at San Diego State, has been in San Antonio's program before, both as a full-fledged member of the Spurs and also with San Antonio's D-League affiliate in Austin.
Since going unselected in the 2011 NBA Draft, Thomas has had NBA stints with the Spurs, Golden State and Chicago in addition to a high-profile job abroad with Israeli powerhouse Maccabi Tel Aviv.
The 6-foot-9 forward racked up 31 points and 13 boards -- highlighted by 6-for-9 shooting on 3-pointers -- in the D-Fenders' road loss Saturday night to the Santa Cruz Warriors before being pulled from Sunday's game at Bakersfield in advance of his callup to San Antonio. Thomas also rumbled for 36 points and 18 boards in the D-Fenders' season-opening loss against Rio Grande Valley.