The frustration boiled over last weekend and Roberston left the ground before the end of the game.
Thomson said it was disappointing that Robertson’s tenure had ended prematurely, but the focus was now on the game against Red Sox.
Ryan said he had not finalised his starting team for tomorrow.
“I’ve got a few different options with players coming back from suspension and injuries, although Corey Adams could be out with an injury,” Ryan said.
“If Corey is out, I might use Garrett Blair up front, and Reece Brew has come in from Carpet Court Thistle. The main thing is we have to lift our intensity from last week, play for each other and sort out our discipline.”