The Celtic ace netted four goals as the Parkhead side demolished Raith Rovers on Tuesday night in the Scottish Communites League Cup.
The Republic of Ireland internationalist will be charged with keeping the goals out at Fir Park tomorrow afternoon as the Hoops come calling, and he believes that Neil Lennon's side look to be warming up after a slow start to the campaign.
"Hooper was getting a bit of stick earlier this season, but by all accounts he was outstanding the other night against Raith," said Randolph.
"He looks to be hitting form just as we're getting ready to come up against them. But I think if you look at the Celtic forward line, they have a lot of players who can hurt you. Which is why we need to be switched on.
"We were all really disappointed at the manner in which we acquitted ourselves at Ibrox on Wednesday night, but we can't afford to feel sorry for ourselves.
"This game is at Fir Park, we have done very well in the league so far and this is an opportunity for us to put down a marker."
While Motherwell came up short of what many had expected at Ibrox on Wednesday, Randolph believes that heading straight into another high-profile game is an ideal platform for Stuart McCall's side to recover.
"It's another big game for us and that is what you want," he said.
"Against rangers the other night, I felt we were under pressure right from the very first kick. For that first 10 minutes it felt as though they were coming at us time and time again and it makes it hard to find your feet.
"We feel as though we have made big strides as a team and it is by coming up against the top teams that you get the chance to show that.
"Celtic on their day are a fabulous side, but we are capable of going out and winning the game.
"We know that we are capable of much better than we showed against Rangers. This is a chance to go and show that."