McFadden is a free agent once again after impressing with five goals in 13 appearances for the Fir Park outfit in the latter part of last season.
It was the 28-year-old's second stint with Motherwell, who are thought to be keen to bring him in on a permanent deal but face competition from SPL rivals Celtic.
"I'm not sure about Faddy. A year ago he was here and then went to Sunderland," McCall told the Daily Record.
"Then he came back for training and ended up signing. As far as I'm aware he's still mulling over his options. He wants to make a decision for a decent pre-season. We'd love it to be here and while we've not given up on it I can't give an answer either way."
While McCall waits over the McFadden situation, players with a turn of speed are top of his shopping list following the departures of Henrik Ojamaa and Chris Humphrey
"We've lost a bit of pace with Humphrey and Ojamaa leaving the club and I'd like to bring in at least one quickie in the next few weeks," he added.
"We all have targets, we aim as high as we can and if we can't get them then we move on down the list."
The loan market is another option for McCall, who is realistic over the possibilities of luring players from south of the border.
He continued: "Last year we didn't go down the loan route with English clubs but we might do that with one or two.
"It's becoming harder to do that in a financial sense because the parent clubs are less willing to pay the bulk of their wages and also because even League Two clubs are able to match the wages we can pay.
"Clubs are also more reluctant to allow players to come up here because it ties their player up from one transfer window to another.
"Then again some agents might sway their clients away from playing in Scotland - it's maybe not so attractive to some because Rangers are no longer in the top division."