Only if they were shockingly out of form and hadn't played for their club in months.
Specifically in relation to Gilmour, I think his talent is so far ahead of the rest of the options that I'd probably still play him anyway - especially if the option was to bring in a totally different type of player like Jack or McTominay. Good teams need players that can dictate the pace and direction of play and that's what Gilmour brings to Scotland, and it's what we've been missing for years and years. Incidentally, it's also what Man Utd's midfield has been lacking as well so, although he certainly has his merits, I don't ever see McTominay being a direct replacement for Gilmour in our midfield.