The Rays will have to make a corresponding move to clear a spot on their 40-man roster for Geltz before Monday's 1:10 p.m. ET game against the Red Sox.
DeJesus, out since June 18 with a fractured left hand, went 5-for-22 with four walks in eight Minor League games. The 34-year-old outfielder was one of the Rays' most productive hitters this season before going down with the injury, batting .269/.367/.440 in 62 games. He said he is fully cleared to play and has been told he won't need offseason surgery.
"It's great to play," DeJesus said. "It's going to be sore sometimes, but it's not going to break, it's not going to tear anything, so now it's just getting through it and finish the year strong. ... I just want to be with the guys. I want to help the team win."
The Rays optioned Casali to Charlotte on Tuesday so they could bring him back up Monday, and the 25-year-old backstop was able to appreciate one aspect of the unusual assignment: He's now played at Class A, Double-A, Triple-A and the Majors in a whirlwind season.
"It is weird. This year in general has been pretty crazy for me," said Casali, who is hitting .169/.246/.203 in 23 games with the Rays. "I wouldn't have it any other way. It builds character, and it's been fun."
Gomes has split the season between Tampa Bay and Durham, compiling a 2-2 record and 4.50 ERA in 24 innings with the Rays and a 3.62 ERA in 27 appearances for the Bulls.
Geltz, 26, has gone 3-3 with a 2.38 ERA, 60 strikeouts and only 17 walks in 41 2/3 innings over 29 appearances for Durham this season. In May, Geltz received a 50-game suspension after testing positive for a drug of abuse.
Bill Chastain is a reporter for MLB.com. Adam Berry is a reporter for MLB.com. Follow him on Twitter at @adamdberry. This story was not subject to the approval of Major League Baseball or its clubs.