Keppinger missed Wednesday's game due to an unspecified personal matter to which he had to tend at his home in Dacula, Ga.
"I just had some personal things to take care of," Keppinger said. "I wouldn't like to miss any days, if possible, but it was something I needed to take care of and they allowed me to go home and take care of it."
Keppinger arrived back in New York late Wednesday night. He said he watched the Rays' 4-1 comeback win over the Yankees on Thursday.
"It was a good ending," Keppinger said. "The good guys won."
Allen, who had a big pinch-hit single in the win, said his quad has been bothering him since the Rays' series at Texas. When asked if he was surprised to be put on the disabled list, Allen said, "You have to take care of it. Nip it in the bud right now. Get back sooner than later."
Rays manager Joe Maddon commended Allen for doing "a great job" for the Rays.
"He's been feeling kind of ratty," Maddon said. "And then ... he did feel it again, running into second base [Wednesday night]. ... It's kind of a strain, and it's not getting better-better, so we just decided to do this and just make sure that he's well."
With Allen going on the DL, Brandon Guyer will remain with the Rays for the time being.
"That's just baseball -- you can never assume anything," said Guyer, who expected to be sent back to Triple-A Durham upon Keppinger's return. "I really thought I was just coming up for a day. ... I feel bad for Brandon; I hope he's all right. I just want to try and help the team win any way I can."