Derek Williams has made a career out of his resemblance to Mr Eriksson
An English comedian has allegedly tricked a Mexican football club into thinking he was the national team's new coach, Sven-Goran Eriksson.
The Mexican football federation has warned clubs to be on their guard after Derek Williams was given a tour of Club Universidad Nacional's stadium.
He reportedly sent the first division team falsified documents which appeared to have come from the federation.
The federation later released a statement saying that he was a double.
"At the moment the real Eriksson is in the United States. The person claiming to be him is only a lookalike. This shows a complete lack of respect," the statement said.
Derek Williams reportedly spoke to Universidad Nacional's coach, Ricardo Ferretti, saying that he had come to watch some of his players ahead of his first squad selection.
"To be honest I was quite amused," Mr Ferretti said. "The fake Eriksson told me that he was watching my players ahead of his next call-ups, and I believed him."
The Eriksson lookalike was given a tour around the field, accompanied by two glamorous women, and then allegedly issued a statement to unsuspecting journalists and posed for photographs.
Sven-Goran Eriksson was appointed Mexico's new coach in June after being sacked as manager of England's Manchester City club.