It all looked too easy. There was a collective holding of breath when Stephen Welsh was replaced midway through the second half but Celtic’s movement exploited a St Mirren team who bossed them in Glasgow less than two weeks earlier.
Tom Rogic started proceedings with a throwback to some of his classic performances. His close control and ability to shift from right to left in an instant created space inside the St Mirren box despite the defence packing around him.
Scott Brown continued to look rejuvenated, as did Ryan Christie, who came on for Albian Ajeti and confused defenders with his perpetual motion.
St Mirren are a solid side, one of the form teams in Scotland. After last night, we were left wondering what could have been?
Let’s hope Stephen Welsh makes it for Perth on Sunday. I suspect a solid back four has a lot to do with the run of three consecutive wins, with 10 for and 1 against. Stephen may never be Baresi, but his inclusion in the line-up for these three games arrested a persistent problem.