Matthew will make his Port Adelaide debut on Saturday night, but will have to wait at least another week before he is able to play alongside his brother.
Justin, 21, hasn’t missed a training session all summer and will be rested from the clash with the Swans. Matthew will take his brother’s place in the Power forward line, but Cripps warned fans not to expect "too much" from the skinny 19-year-old.
"Matty is probably, physically, two or three years away from being where we’d want him to be," Cripps said.
"We understand that he’s come from a system where weights haven’t been a priority, so that will be his focus this year, but he does get an opportunity this week. He showed us a couple of things in the internal trial in January and he’s similar to Justin. We like the way he moves. He’s got great agility; great speed and he can take a catch.
"We’re not expecting huge things from him. We just expect him to be competitive and to play within the structures we’ve got up there in the forward line. Whether he’s going to be good enough in the long term – only time will tell, but we’ve been really happy with what he’s done so far at training."
Justin booted 34 goals in his impressive debut season and finished fourth overall in the NAB Rising Star award.
Cripps was confident the two brothers could form a formidable forward line partnership in the years to come. "We expect Matthew to play long-term – that’s why we got him down here," he said.
"Again, in terms of Matthew’s development as compared to Justin’s, Justin is probably 12-18 months ahead of him. Justin spent a year playing for the Centrals league team before coming here, whereas Matthew spent most of last year in the twos.
"But Matthew’s probably a better kick than Justin and, in saying that, Justin kicked them all right last year."
The younger Westhoff received some goalkicking tips from coach Mark Williams at training on Friday, but the senior coach took a back seat for the majority of the session and put his leadership group in charge.
One of the more humorous and unorthodox drills set by the group was Brendon Lade’s "tough man" drill, which resulted in the players taking aim at sitting duck Daniel Motlop.
"The leadership group pick the drills and Brendon Lade came up with the idea of the "tough man" drill. I think he might have got the idea from Justin Peckett, who has been doing some work with our leadership group, because that was something 'Pecko' had the boys at St Kilda doing many years ago," Cripps said with a laugh.
"Ladey liked the idea and thought he’d give it a go. It worked last week and they had a bit of fun with it, so it’s their session, their drill. The boys stand in a circle with a footy each and they kick it straight up, high in the air. You have to look straight ahead with your hands behind your back and make sure you don’t flinch as the balls come back down.
"If you flinch there’s a penalty and you might have seen Daniel Motlop in the goalsquare at the end there getting the balls kicked at him. Obviously, he flinched."
