The central midfielder has impressed in training since coming back from his loan at Boca Juniors.
And Potter is so happy with the player that he may give him a Premier League star against Sheffield United on Saturday.
It is a strong possibility given Dale Stephens is likely to miss the game.
Potter told reporters: "He (Mac Allister) has had a good couple of days training and is adapting to the wonderful climate we have at the moment!
"He has looked good.
"We have got a good squad available for the game so we will make the decision tomorrow."