The Fir Park club are set to re-sign James McFadden on Wednesday and manager McCall is still to decide on whether to make Estonian trialist Henri Anier his seventh summer signing.
Former Scotland defender Stephen McManus - who missed last night's 4-2 defeat to Newcastle - put pen to paper earlier this month and joins fellow new recruits Paul Lawson, Iain Vigurs, John Sutton, Fraser Kerr and Gunnar Nielsen.
But McCall says he is still after another pacey wideman and could follow Saints boss Danny Lennon's lead by taking some of the Geordies' youngsters on loan.
St Mirren borrowed both Paul Dummett and Conor Newton last term and made the most of their talents by winning the Scottish League Cup.
McCall said after Tuesday night's friendly defeat to the Magpies: "I did speak to Alan Pardew about some of his lads. He told me some of them are going to the Championship. He told me if there was any of the others that I saw and was interested in, I was to stay in touch."
Among those who caught the eye was England Under-19 winger Adam Campbell and McCall admits he may make a move.
"The little lad Campbell who came on up front was quick and I'd like to get a get a quick wide man in who can play left and right," he said.
"We are still trying to search for that. Whether there is enough left in the kitty or if we can get the right one in remains to be seen. I don't just want to bring someone for the sake of it.
"It might be a younger one from the Premiership who comes in for six months on loan. St Mirren did that last season with the lads Conor Newton and Paul Dummett from Newcastle.
"We've got no out and out pace anymore since Chris Humphrey left so ideally I would like a wide player in."