Bristol City have re-signed Middlesbrough defender Stephen McManus on a 93-day emergency loan, subject to approval.
The 30-year-old Scotland international, who spent a brief spell at Ashton Gate towards the end of last season, has made only one league appearance for his parent club this season.
City manager Derek McInnes said: "Last season I felt he came in and gave us a real lift. Hopefully he can do something similar this time around.
"Of course his loan spell was curtailed early last time and I think he feels he has unfinished business here. He was desperate to come back and now we have him for the next three months.
"Stephen is experienced at Championship level, has battling qualities, defends his box and can be the first-ball winner. He'll be very dominant and a good professional to have about the place."
McManus started out at Celtic, where he won three Scottish Premier League titles, two Scottish Cups and two Scottish League Cups and joined Middlesbrough in a ?1.5million deal in July 2010 after an initial loan spell.