Steele came off the ground in the third quarter of Saturday night's 14.8 (92) to 5.11 (41) victory over the Western Bulldogs with concerns over his right shoulder and played out the game, albeit with limited range in his arm.
The 27-year-old ruptured the AC joint in the same shoulder last year, requiring surgery and his injury added a sour note to a night where the Saints went 2-0 under Ross Lyon.
"It's not feeling great but we'll just have a few scans and see how it is," Steele told the Seven Network.
Lyon said the Saints were "hopeful" Steele had avoided serious injury.
"We're hopeful but he will go for scans tomorrow," he said.
"So look, fingers crossed.
"It is the same shoulder. Is it an AC or a hairline fracture? So we don't know."
Lyon was otherwise confident the Saints had avoided injuries but said his players needed to get used to the hard surface at Marvel Stadium again.
"There's a couple who are a little bit sore but we're optimistic they'll come through," he said.
The Saints will celebrate their 150th anniversary against Essendon next Saturday.
"We'll enjoy tonight, seven-day break," Lyon said.
"Go watch Essendon tomorrow, we're gonna have the 150th anniversary at the MCG.
"It's a really big week for the club and a big night but as a playing group we'll try and honour that with the effort that it deserves, show the esteem we hold this club in.
"But in saying that, we can't get caught up and distracted. We've got to be unwavering in our commitment to how we prepare."
