Sunderland can sign Trabzonspor fullback Ondrej Celustka for £2.5 million.

Celustka has impressed in the opening games of the season on-loan from the Turkish club.

As is this the case with all overseas loans, a clause has been built into the deal to convert it into a permanent switch, says the Sunderland Echo.

But Sunderland would have to pay a fee of £2.5m to activate that agreement next summer, if they want to keep the 24-year-old.

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