Morrison, 21, was one of West Ham's best performers during the first half of the season and was even tipped as an outsider to make England's World Cup squad.
But the former Manchester United prospect has not played since January amid more talk of issues off the field, and this week dropped down a division to move to Loftus Road
But Hammers boss Allardyce on Thursday refused to elaborate on the reasons for farming out the talented youngster.
"I'm not answering questions about Ravel Morrison because he is not with us any more," he said.
"We've done a deal with QPR and we are playing football against Southampton on Saturday, my focus is the squad of players I've got here.
"The fact of the matter is Ravel wanted to play some first-team football and he wasn't getting as much here as he wanted so we've let him go out on loan.
"Our consistent performances and recent acquisitions have given us a bigger squad and Ravel has found it a bit more difficult to get in.
"We move on to Southampton with the players we've got here at the club."
When asked if Morrison had played his last game for West Ham, Allardyce responded: "No!"