Erik Sviatchenko left Celtic this past summer but some fans of the Parkhead side want him back.
Celtic have sold Stuart Armstrong to Premier League side Southampton.
Scottish Premiership giants Celtic have already bid farewell to three players, Jamie Lindsay, Sam Wardrop and Erik Sviatchenko, this summer.
Erik Sviatchenko officially left Celtic on Monday afternoon.
Erik Sviatchenko has left Celtic on a permanent basis after spending the second-half of this past season out on loan.
Erik Sviatchenko spent the second half of the season at Midtjylland on loan from Brendan Rodgers’s Celtic.
Erik Sviatchenko left Scottish Premiership giants Celtic in January - but then won the Danish Superliga with FC Mitdjylland.
FC Midtjylland have clinched the Danish Superliga title, and Celtic's Erik Sviatchenko was instrumental to their successful campaign.
Erik Sviatchenko's future at Celtic is in doubt after leaving the club on loan in January.
Celtic earned their seventh consecutive Scottish Premiership title with a win over Rangers on Sunday.