The Liverpool defender joined Red Bull Salzburg on-loan in the summer, but is yet to start a league game in Austria this season.
The Spaniard is considering his future at Red Bull Salzburg.
Leeds United may end up having to sacrifice a lot if Red Bull take the helm.
Championship side Brentford are keen on signing Austrian Under-21 international Marco Djuricin.
Red Bull Salzburg winger Kevin Kampl has been linked with a move to the Premier League - but could instead go to Leipzig.
Here is how Celtic and Red Bull Salzburg will line up in the Europa League clash tonight…
Red Bull Salzburg midfielder Kevin Kampl is looking forward to playing against Celtic in the Europa League on Thursday.
Manchester United striker Angelo Henriquez continued his fine form, grabbing a goal, as Dinamo Zagreb were well beaten by Red Bull Salzburg.
Red Bull Salzburg striker Jonathan Soriano could offer the perfect answer to Tottenham Hotspur's goalscoring problem.
Everton and Southampton are both said to be keen on Mejdi Traoui. But a pinch of salt may be needed.