The former Manchester City, Derby and Norwich winger has impressed during his time up in Scotland.
Talks have begun with the Saints over a new deal, but it is understood that SPL rivals Aberdeen and Hibernian are also keen to talk with him.
Birmingham City, the Millers and Sheffield United are also thought to be keen to offer him the chance of a route back south.
However, there is also an option for Croft emerging from America, and the chance to play in Major League Soccer.
Source PA