Mark Viduka's former club are reported to have offered £750,000 for McDonald, the Australian international who was the subject of a failed £400,000 bid from Rangers - Celtic's Old Firm rivals in Glasgow - on January's transfer deadline day.

Neither club has confirmed the deal for a player who will be entering the final year of his contract this summer.

However agent Lou Sticca is optimistic McDonald will sign a pre-contract agreement with another club shortly.

McDonald was on international duty for Australia on Saturday, appearing as a substitute in a 2-0 win against China.

Sticca revealed: "There is interest in Scott from a number of clubs but I wouldn't wish to confirm which clubs at this moment in time.

"However, it is correct to say that discussions are at a fairly advanced stage and something could be sorted out sooner rather than later.

"I have been in constant contact with Motherwell and they are fully aware of where the interest is coming from."

The departure of McDonald could lead to a player exodus from Motherwell, with midfielder Brian Kerr warning earlier this month that he could be the first to follow.

Kerr said: "We can't afford to lose Scott McDonald if we want to go forward as a club."