Ulihrach will appeal against a two-year ban he picked up after he tested positive for the drug nandrolone.
Ulihrach says he never knowingly took anything
Ulihrach, the former Czech number one, tested positive during a
tournament in Moscow last October.
But he maintains that he never knowingly took the drug.
He said he would appeal the mandatory two-year penalty
handed down by the ATP.
"My first explanation is that my body produced a little bit
more of it," said Ulihrach.
"The second is that I ate or drank something bad in
Russia, maybe an energy drink without a proper label."
Ulihrach added that he tested negative at the US Open at the end of August and
also in Vienna, a week after the Moscow test.
Ulihrach turned professional in 1993 and has won three ATP
Tour singles titles. He has not played so far this year because
of a partially torn calf muscle.
He is the second Czech player to test positive for
Petr Korda, the 1998 Australian Open champion and former
world number two, failed his test for the steroid at Wimbledon in 1998 and was given a one-year ban a year later.