An airborne Johnson elected to bump as Nasiah Wanganeen-Milera got a rushed kick away in St Kilda's upset 28-point win over the Demons in Alice Springs on Sunday.
Wanganeen-Milera missed most of the second term while assessed for concussion, but was cleared to return.
The star playmaker finished with 29 disposals and 795 metres gained in a stand-out display.
"I just wanted to come back and play my role, and it was good to get the win," Wanganeen-Milera told Channel 7 after the match.Â
Johnson, 25, was selected by Melbourne with pick No.68 in last year's national draft.
He was suspended after his debut match in round one for a spearing tackle on GWS forward Callum Brown.
The fact his bump on Sunday got his opponent in the head could spell bad news for him.
"Obviously when someone comes off to get assessed they're going to have a look at it, so we'll just let that play out as the week unfolds and see where that sits," Melbourne coach Simon Goodwin said.
"Fortunately for Nasaiah he came back on the ground and passed his concussion test, so we'll wait and see how that plays out during the week."
St Kilda coach Ross Lyon wouldn't be drawn on Johnson's bump for fear of creating more controversy, following a bitter fall-out from his "AFL nepo baby" comments about Gold Coast a week earlier.
But Lyon did raise concerns after St Kilda's Hunter Clark was penalised for high contact in a contest with Trent Rivers, while adding he was pleased Fremantle captain Alex Pearce was cleared of rough conduct last week over his collision with Darcy Byrne-Jones.
"I like the physicality of the game. I'm concerned where the game's heading," Lyon said.
"I understand the head's sacrosanct and all that but there was one with Hunter Clark where he went down at the ball and won it.
"I'm glad Alex Pearce got off. I'm not the MRO. I'll leave it to them.
"You just hope both teams and everyone in the comp gets a fair shake."
Meanwhile, Rowell was cleared of any wrongdoing for his glancing jab to the face of Fremantle's Neil Erasmus.
Rebounding defender Daniel Rioli also had no case to answer for an incident in which he rushed in and caught Andrew Brayshaw high in the dying moments of Fremantle's 11-point win.
Dockers forward Jye Amiss was fined $3000, reduced to $2000 with an early guilty plea, for striking Sam Collins.
