The striker’s current club Stuttgart are looking to sell in the ongoing transfer window as his contract is due to run out next summer.
At present, the Bundesliga outfit have not received any concrete offers, though that could be set to change in the coming weeks.
The chase for the 25-year-old is heating up and, according to Sky Deutschland, Manchester United, Southampton, West Ham and Brighton are all interested.
And Manchester United have made solid moves, holding talks over signing Kalajdzic.
The Red Devils want to bring in another striker and the man with 22 goals in 48 Bundesliga games to his name is in their sights.
A move to Old Trafford could be a tempting prospect for Kalajdzic.
Bayern Munich have also been linked with the striker as a possible replacement for Robert Lewandowski, but they have not yet shown serious interest in the Stuttgart man.