Suarez shouldn't be in the starting 11 - if he gets injured even for a month, we're going to find it difficult in the league. It's all precariously balanced, and to risk him for an FA Cup game against Oldham would be nuts.
In the same vein, I wouldn't want to see Henderson, Lucas, Sterling, Coutinho and Johnson anywhere near the starting 11 either. They've played a lot of football, and again, the last thing we need is them pulling up with injuries because they've been playing so much football lately.
It's a game for Aspas, Moses, Alberto, Gerrard, Toure etc. A bench of the stronger players in case we need them to come on and get a couple of goals, but really, the fringe players should be winning this game.