"That's a pressure we could do without and I would prefer if we could make these decisions when we need to make them."
Porter, who arrived at Fir Park from Oldham Athletic in 2007, is Motherwell's leading scorer with eight goals and netted 18 times during the previous campaign.
Prior to Hearts' 1-0 defeat to Well this month in which Porter scored the winning goal, Tynecastle manager Csaba Laszlo admitted his admiration for the player but stressed the forward was just one of several targets.
"He is definitely a very good player and I definitely need a goal-scorer," said Laszlo on 6 January.
Laszlo has already secured the services of midfielder Ian Black on a pre-contract from Inverness.
"I want to bring more Scottish players in the club for the future," he added at the time. "Black was the first step, but it's not finished."
"But I also have players from the Primera Liga in Spain who would like to come to work with me - and Portugal and Germany too."
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