Liverpool target Martinez wants Premiership move
"I see Premier League matches on the television and the atmosphere is wonderful," he told skysports.com.
"But I don't really know anything [about the interest] as I haven't spoken with anyone.
"My sole mission at the moment is to work hard for Athletic and help the team.
"If an offer does arrive I would look at what is best for two parts, myself and Athletic."
Bilbao have admitted that they are aware of the interest in their prized asset - although they would appear to have few intentions of selling.
"We have not received any formal offers yet," a spokesman said.
"We are calm about the situation."