Deeney was signed from League One side Walsall for a fee which could reach £500,000 on Friday afternoon and after a dash to Carrow Road managed to make a substitute appearance during the 3-2 win over Norwich later that evening.
He could now start against the League Two Shots as Mackay looks to use all of his small squad.
Other players in contention to start include new goalkeeper signing Rene Gilmartin, Ross Jenkins, Michael Bryan, Liam Henderson, Piero Mingoia and Eddie Oshodi.
Young defender Dale Bennett is the only injury concern as he battles to regain fitness from a knock.
