Former University of Texas forward Jonathan Holmes has agreed to play for the Celtics’ two summer league entries.
Holmes, who averaged 10.3 points and 6.1 rebounds as a senior for the Longhorns, was one of the more surprising omissions from Thursday’s NBA Draft. Jonathan Givony, publisher of DraftExpress.com, had projected that the 6-foot-8-inch, 240-pound senior would be drafted by the Celtics with the 33d overall pick.
Colton Iverson, a 2013 second-round pick, is also expected to join the Celtics’ summer league team, according to his agent. This would be the third consecutive summer appearance with Boston for Iverson, a 7-footer who spent the last two seasons playing in Turkey and Spain.
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The Celtics spent much of Friday working to assemble their summer roster, which is expected to include returning players Marcus Smart, James Young, and Chris Babb, as well as new draft picks Terry Rozier, R.J. Hunter, Jordan Mickey, and Marcus Thornton.
“When [the draft picks] see how hard Marcus and James and Babb go at summer league practice starting next week, it’s going to be real,” Celtics coach Brad Stevens said Thursday. “And so that’s a positive thing.”
Next Saturday, the team will depart for Salt Lake City to participate in the Utah Jazz Summer League, along with the Jazz, 76ers, and Spurs. Then on July 10 the Celtics will travel to Las Vegas for an 11-day, 24-team league that will include playoffs.
Gary Washburn of the Globe staff contributed to this report. Adam Himmelsbach can be reached at adam.himmelsbach@globe.com. Follow him on Twitter @adamhimmelsbach