The man on loan from Rio Ave was terrific in the fifth round against St Johnstone, scoring two second half goals and going close to grabbing a hat-trick on a couple of occasions.
A number of other players, including Kilmarnock's Paul Heffernan and Dundee United's Johnny Russell are in the running for the prize, which is voted for by the fans.
Anyone who wants to help Isma win the prize needs to have a Facebook account and then visit http://apps.facebook.com/my-polls/kkyjx to cast their vote. The poll closes on Friday so get voting!
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Source: Mirren MAD