Shrewsbury have agreed to make midfielder Jimmy Ryan's loan move from Liverpool permanent on 1 January.
"Because Jimmy came on a temporary loan, you can only have 93 days playing for a club," Shrews manager Gary Peters told his club's website.
"From today, he will be on loan for another month - after that, he can play in our reserves but not the first team.
"Technically he won't be our player until 1 January, where he can then play first-team football indefinitely."
Ryan has made four league and cup appearances since joining the Shrews in August.