If, as is quite possible, Hickey, Patterson and Tierney are all ruled out through injury I think we should go to four at the back. The wing-back system only benefits us with the Tierney/Robertson pivot and we are weakened greatly trying to play the same system without Tierney. Porteous has (I think) played as a right-back for Watford this season and Hendry and McKenna as centre-backs with Robertson at left-back. Midfield of five consisting of Christie, McTominay, McGinn, Gilmour and McGregor with Shankland or Dykes or Adams up front.