Dwayne Peel’s side are suffering from with injuries at lock with Wales international Aaron Shingler, Tonga star Sam Lousi, Josh Helps and Lewis Rawlins sidelined.
“We have picked up a few injuries in the second row department in the opening weeks of the season,” said Peel.
“So we have brought in Lloyd for the remainder of this block of matches. He is an experienced player, a proven performer at this level and has slotted in well with the group this week.”
The loan deal is for the next three weeks, although Ospreys do have a call-back option.
Ashley has joined up with Scarlets this week for training ahead of their United Rugby Championship match against Munster on Sunday.
Ospreys have strong second-row resources with British and Irish Lions duo Alun Wyn Jones and Adam Beard joined by Bradley Davies and Rhys Davies.
