McGhee only makes the three enforced changes from the side that lost to Hibernian last weekend. Pawlett, Paton and Aluko all return to the starting line up in place of Ross, Maguire and Fyvie. Match official today is Euan Norris.
Aberdeen: Langfield, Mulgrew, Foster, Pawlett, Considine, Ifil, Kerr, , McDonald, Miller, Paton, Aluko.
St. Johnstone: Smith, MacKay, Gartland, Grainger, Rutkiewicz, Davidson, Craig, Millar, Morris, Samuel, Johansson.