The former Stockport cornishman has been on the bench or injured for most of the season since he signed for £150,000 in September.
Tonkin has only made one start in an Alex shirt at Cardiff City but Saturday could be his best chance yet. Dario Gradi says he may play Tonkin at left back and move Vaughan onto the left wing:
"I will probably play Anthony at left-back at the weekend as I want to put David (Vaughan) further forward and it's a question of whether I opt to move him now or wait any longer,"
"Sooner or later we've got to give Anthony a go and I think Vaughany can do that job in front of him as well."