Montreal Alouettes (current team)

In May 2008, McPherson was signed by the Montreal Alouets of the Canadian Football League. He debuted with the Alouettes in a CFL pre-season game, on June 12, 2008, against the Toronto Argonauts. He completed four of eight passes for 105 yards, and one touchdown pass. The Alouettes and Argonauts played to a 34-34 tie in Montreal. McPherson currently backs up Alouettes legend Anthony Calvillo at quarterback.

He started his pro career with the Indiana Firebirds of the Arena Football League, where he threw 61 touchdowns and only 5 interceptions, and ran for 19 touchdowns. Because of his exceptional play, he was named the 2004 AFL Rookie of the Year. He could have opted for the 2004 NFL Draft or a Supplemental Draft but chose to pay his dues in the AFL and prove to the NFL that he has matured.

Later that spring McPherson was selected by the New Orleans Saints in the fifth round of the 2005 NFL Draft.

Before McPherson signed with the Saints following the 2005 NFL Draft, he was acquired by the Utah Blaze of the AFL in their 2005 expansion draft. The move was widely considered to be a gamble, considering what his unknown status before the NFL's 2005 Draft. Following the draft, McPherson was placed on the "other-league exempt list" until further notice.

Finally on November 9, 2006, McPherson was activated to the league and a week later traded to the Austin Wranglers in exchange for future considerations.

McPherson was signed by the Grand Rapids Rampage in 2007 as a back-up quarterback for Chad Salsbury. That season for the Rampage, he completed 76 of 129 passes for 819 yards and nine touchdowns with four interceptions.

In 2008, McPherson went 27-for-50 for 368 yards and four touchdowns