Celtic are expected to bolster their squad ahead of an upcoming Europa League campaign.
Celtic boss Brendan Rodgers will be desperate to see his Hoops side progress in the Europa League after qualifying for the knockout stages after Christmas - but there are a number of positions that need strengthening if they are to succeed.
Rodgers needs a new centre-back, a goalkeeper and another option in attack if the Hoops are to beat Zenit St. Petersburg in the round of 32 which takes place in February. Here are three players Rodgers can form a reunion with in Glasgow.
Martin Kelly (Crystal Palace)
One-time England international played under Rodgers at Liverpool but is now out of favour at Crystal Palace under another former Liverpool manager in Roy Hodgson.
With just six months left on his contract at Selhurst Park, the versatile defender could be available on the cheap in January and solve Celtic's most obvious problem area at the heart of their defence.
Danny Ward (Liverpool)
Craig Gordon has hardly been the standard required at Celtic this season, and with the former Sunderland stopper nearing the end of his career, a replacement should be considered.
At the other end of his career, 24-year-old stopper Ward was Liverpool's reserve goalkeeper under Rodgers. Still out of favour, the Wales international would be a fantastic signing after shining on loan at Huddersfield last term.
Nathan Dyer (Swansea City)
Jonny Hayes' broken leg has left Celtic slightly out of depth in attack, with Patrick Roberts also sidelined. It leaves just James Forrest and Scott Sinclair as options out wide.
The 30-year-old worked with Swansea during Rodgers' two-year spell in Wales, and the pocket-sized trickster is out of favour with the Swans - making just 10 appearances this season.