Midfielder trained with the Championship club during a holiday in Engand.
Newcastle Jets CEO Robbie Middleby confirmed the club have not received a formal offer from Milwall for captain Ruben Zadkovich.
Reports on Monday indicated the London-based Championship club were preparing to submit an official bid for the 27-year-old, who is expected to return to the Hunter Stadium this week following an extended break.
He was granted time to convalesce with family in England after representing Australia at the East Asian Cup earlier in the summer with Lions boss Steve Lomas revealing to The Herald yesterday that the Socceroos midfielder was training with his squad after being invited to visit the Lions.
Despite this Middleby insisted that Zadkovich, whose contract doesn’t expire until the 2014/15 season, is still a Jets player.
“Ruben was scheduled to have a week off following his commitments with the Socceroos,” Middleby told Football Australia.
“He asked for the opportunity to take up Millwall’s offer of a visit during this time and we have accommodated that request.
“At this stage, we have not received any formal offer for Ruben and he remains a Newcastle Jets player.”
Zadkovich previously spent two years in England at Derby before returning the A-League with Newcastle and also had spells at QPR, Notts County and Sydney FC.