The Scouser became the first Motherwell player to score 20 goals in one season since the legendary Willie Pettigrew in campaign 1975/76 when he opened Well's account in the 2-1 victory at Hearts on Saturday.
With the Steelmen seven points clear of sixth-placed Hibernian, with just 12 left to play for before the split, a win at Aberdeen on Saturday, coupled with results elsewhere going their way would allow McCall to persuade Higgy to put pen to paper in the near future.
The Fir Park gaffer said: "It was a great finish from Higgy and a fitting way for him to reach the 20-goal mark this season.
"When you consider that the likes of Owen Coyle, Tommy Coyne and Dougie Arnott, have all played for the club since it was last done that really puts his achievement in perspective.
"Obviously getting Higgy to re-sign will be an absolute priority for me, but that can't happen until we have that top six slot nailed down and our budget for next term is known.
"So there is no way we can get carried away with things, but we want Michael to stay and both he and his agent are aware of that.
"I think he is very happy at the club and that is also a big plus in that regard as he is settled at Motherwell.
"But Higgy is not the only one we will be looking to get to the table once we have the top six place nailed down.
"At the same time there is no way we are complacent about that and we know that we have another huge match at Aberdeen this weekend."
Ironically, the contrast between Higdon and the man he replaced at Fir Park, John Sutton could not have been more graphically illustrated than by Saturday's match at Hearts.
While Sutton elected to make the lucrative move to Gorgie two campaigns back after posting a career-best 17-goal haul for Well the hugely likeable Englishman's career since that departure has stalled dramatically.
After falling out of favour with Hearts' ever-changing management, Sutton headed to Australia for a spell before being recalled from the cold in a bid to arrest Hearts dramatic plunge down the SPL table.
While he scored his sixth of the campaign for Hearts against his former club with a trademark diving header the powerful forward's future is enveloped in uncertainty with his Tynecastle contract up at the end of the campaign.
Higdon, however, has now cemented his status at the top of the SPL's scoring chart with a succession of superb strikes and it will be fascinating to see if he does stay on after the completion of the current season.
Yet while McCall refused to take a top-six place for granted the truth is that Motherwell are now firm favourites for second place and the Europa League berth that accompanies it never mind a top-half slot.
But the Well boss remained cautious. McCall said: "There are still some very tough games to play for us between now and the split starting at Pittodrie against an Aberdeen side who are still very much in the hunt for Europe.
"But we can take real satisfaction from the way we have responded to our loss at Ross County with back-to-back wins over Celtic and Hearts.
"It may have taken us a while to get successive victories, but it was worth the wait."