Scottish Premiership rivals Celtic and Rangers have both been linked with signing Steven Caulker in the last year or so and now he is a free agent.
Pontus Jansson has become the latest Leeds United defender to suffer an injury ahead of the festive period.
Celtic boss Brendan Rodgers is reportedly on Aston Villa's radar, and the Championship side are apparently planning an approach.
Championship strugglers Aston Villa have been linked with many free-agent defenders but are they running out of options?
Aston Villa are one of several clubs credited with interest in Caulker.
Aston Villa and Wigan Athletic reportedly want to sign Steven Caulker on a free transfer.
Aston Villa are reportedly hoping to take former Dundee defender Steven Caulker on trial as Steve Bruce's Championship side look for a centre-back.
It seems highly unlikely that Aston Villa would be pushing for Steven Caulker if they could also bring in John Terry.
James Collins has reportedly been hoping to re-join Aston Villa.
Aston Villa are believed to want central defender Steven Caulker on a free transfer.
Liverpool and Everton have both been credited with an interest in signing the Ajax star.
Tottenham Hotspur have reportedly opened talks with Bruno Fernandes's agent.
Tom Heaton has rejected a contract at Burnley with Premier League newcomers Aston Villa interested.
Ibrox side Glasgow Rangers released ex-Celtic trainee Liam Burt last month.
Leeds United shouldn't give up trying to sign Ryan Kent.
Liverpool, Tottenham Hotspur and Everton are all allegedly interested in signing the Mainz star.
Leeds United have released Hugo Diaz, whose contract wasn't supposed to expire until next summer.
Celtic are linked with a move for the Danish right-back.
Real Madrid are reportedly keen on signing Tottenham Hotspur ace Christian Eriksen.
Premier League giants Spurs are reportedly keen to sign Italy wonderkid Federico Chiesa from Serie A outfit Fiorentina.