Whelan was at The Den on Sunday to see Millwall draw 2-2 with Cup Finalists Southampton in a pre-season friendly and is said to be considering two deals from the First Division club - a year long contract or a three-month loan.
The Lions currently have an injury crisis upfront, with only Neil Harris fit enough to start the new campaign at home to Wigan this Saturday.
In other news, Juan, the Brazilian midfielder on loan from Arsenal, has been given the number 42 shirt for the forthcoming season.