Keeper set to leave Boro for a permanent move to Bundesliga 2
Middlesbrough continue to be actively involved in the transfer window, and this time around, they may have to allow one of their goalkeepers to leave the club.
The 27-year-old played 19 times for the German side in the just-concluded season and is keen to make his loan deal permanent.
Middlesbrough have already signed a new goalkeeper, Joe Lumley, who joined them from QPR on a free transfer. It means Stojanovic's chances of being the number one goalkeeper could be limited.
Boro are interested in sanctioning his move as long as St Pauli meet their valuation.
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Middlesbrough may have to consider recruiting one more goalkeeper if they allow Stojanovic to leave the club, having allowed Zach Hemming to leave on loan to Scottish side Kilmarnock.