The young tearaway has put his hand up to be the spearhead against England after blowing up Somerset in Taunton, but it's still the lion-hearted Siddle the young bowlers look up to.
Siddle struggled to put the ball where he wanted to in the Australians opening tour match against Somerset and his economy rate was poor.
The 28-year-old's performances on the Australia A tour were also sub-par, with just three wickets from his two games against a weak Ireland and Scotland.
But Pattinson, who took seven wickets against Somerset and a bag for Australia A, said there was no need to panic about Siddle's form heading into the first Test on July 10 at Trent Bridge.
"Maybe this game he didn't bowl as well as he'd have liked, but he's a fantastic player and he'll step up for the first Test definitely," said Pattinson.
"I think Pete's one of those guys who knows his body quite well now, and he's quite a bit older than me and Starcy (Mitchell Starc).
"It's a long series, it's five Tests so he's probably the guy that when the wicket is pretty flat you'll always call to and he does a fantastic job.
"I don't know whether he's saving himself a bit for what's to come, because he's pretty smart with his body now."
Siddle said during the Australia A tour that he was comfortable he was tracking well for the Ashes and wouldn't be fretting about performance.
"I'm pretty relaxed and take it pretty easy," Siddle told AAP.
"I know it's an important series but I'm not going to worry about things leading into it any differently.
"Nothing really plays on my mind too much.
"I know I'm ready to go. I know this is what I've planned for."
Pattinson said he will almost certainly be rested for the Australians final pre-Ashes tour match against Worcestershire starting on Tuesday.
Fellow fast bowlers Ryan Harris and Jackson Bird will get their opportunity to press their claims in Worcester.
Pattinson bowled aggressively and found some reverse swing in the second innings in Taunton.
He struggled in English conditions last year on Australia's one-day tour of the UK and says he's learned not to bowl too wide of the crease and to get closer to the stumps.
Pattinson praised Starc (six wickets for the match) as one of the most dangerous weapons in world cricket and said as a unit, with Harris and Bird still to come into the mix, Australia's attack had something to prove.
"Personally I felt really good out there," he said.
"(Starc's) a handy man to have - a left-armer with good pace. It's hard to find someone like him in international cricket.
"It's going to be pretty good competition now among the fast bowlers to see who gets that final spot in the team."