Kieran Tierney and Southampton midfielder Stuart Armstrong are former Celtic teammates.
Mohamed Elyounoussi joined Celtic from Southampton on loan in the summer transfer window.
Stuart Armstrong joined Southampton from Celtic in the summer of 2018.
Former Celtic midfielder Stuart Armstrong saw his Southampton side lose 9-0 to Leicester City on Friday.
Southampton midfielder Stuart Armstrong is a former teammate of Ryan Christie at Celtic.
The former Celtic hero is struggling for form and starts since leaving Glasgow.
Celtic signed the 25-year-old Norway international on Friday.
Stuart Armstrong was linked with a potential loan move away from Southampton earlier this month.
Former Celtic midfielder Stuart Armstrong could reportedly look to leave Southampton on loan this summer.
Stuart Armstrong could reportedly leave Ralph Hasenhuttl's Saints after playing just 22 minutes of Premier League football this season.
Few rival Premier League players would get in Jurgen Klopp's squad these days - but Southampton's Danny Ings might be one of the few.
Jose Mourinho's Tottenham Hotspur side beat Southampton 3-2 in the FA Cup yesterday, with Ryan Sessegnon's display catching the eye.
Tottenham Hotspur's Luis Binks has linked up for the time being with a former Arsenal striker.
Jurgen Klopp's Liverpool side are currently sat at the top of the Premier League table.
Eunan O'Kane is one of several senior Leeds United players currently out on loan.
Tottenham Hotspur paid £27m to bring Steven Bergwijn to the Premier League and Jose Mourinho already loves Davy Propper's former PSV team-mate.
Glasgow Rangers striker Alfredo Morelos has not scored against Celtic.
Premier League giants Spurs are reportedly losing Luis Binks to Thierry Henry's MLS outfit Montreal Impact.
Steven Gerrard's Glasgow Rangers won at Ibrox but some Bears weren't happy with one Gers player.
Aston Villa youngster Jacob Ramsey was granted his request of a move away to Doncaster Rovers last month.
Celtic sold Armstrong to Southampton in the summer transfer window.
Celtic confirmed their progression to the Europa League despite losing at home to Anderlecht. But who were their best performers? And their worst?
Moss has been appointed Huddersfield Town's new director of football after leaving Brendan Rodgers' Celtic.