Celtic are interested in signing St Pauli goalkeeper Nikola Vasilj in the summer transfer window, according to a fresh transfer report.

The Lowdown: Key summer for Hoops

Ange Postecoglou has a big summer ahead of him, as he looks to make his squad more formidable after their Scottish Premiership triumph.

Celtic will be playing Champions League football next season, which exacerbates the importance of having a big enough group of quality players to battle across several competitions.

Goalkeeper could be an area look the Hoops look to add to with Vasilis Barkas expected to leave, and a new update has emerged in that department.

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The Latest: Officials plot trip to see Vasilj in action

According to Football Insider, a recruitment source has claimed that Celtic are 'closely monitoring' St Pauli stopper Vasilj, with the Hoops 'in the market' to bring in a new 'keeper this summer.

They face competition from Wolves and West Brom, however, so it may not be easy acquiring his signature, but they will send officials to watch the six foot four colossus in action for Bosnia this month.

The Verdict: Good competition for Hart

This would be a good signing for Celtic, with Joe Hart not facing strong enough competition for playing time at Parkhead, having made 44 appearances last season.

Vasilj,  is a five-time capped Bosnia international, highlighting his experience, and he is also nine years Hart's junior, suggesting he could be a long-term replacement for him.

Whether or not Valsilj would be happy to come in as second choice remains to be seen but it isn't impossible to imagine him eventually usurping Hart between the sticks.

In other news, Celtic are believed to be 'keeping tabs' on one player. Read more here.