Ronan Curtis is in the frame for a Republic of Ireland debut tonight against Poland. Picture: Joe Pepler

It is understood the deal agreed with Derry City over the forward's transfer does not contain a clause for further payment in recognition of international honours.

Despite being a Republic of Ireland under-21 international, such a stipulation was not demanded by the Irish club during negotiations over the 22-year-old's summer move.

Curtis was recruited by the Blues in May for a fee believed to be around Â£100,000.

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That continues to look aÂ bargain following the forward's blistering start to his Fratton Park career.

The Republic of Ireland face Poland tonight (7.45pm) in an international friendly.