Prague - Czech tennis player Ivo Minar has tested positive for a banned substance, Czech Tennis Association president Ivo Kaderka told the CTK news agency on Monday.

Minar, ranked 66th in the world, was tested positive for pseudoephedrine after last month's Davis Cup quarter-final against Argentina, it was reported.

The Czech Republic won the tie 3-2 to reach the semi-finals but Minar lost his singles rubber against Argentina's Juan Martin del Potro.

CTK quoted Minar as denying "knowingly taking a banned substance."

The case is being investigated by the International Tennis Federation, the report added. (dpa)