Watson had been on the field for just 60 seconds when his head collided with Dolphins forward Kulikefu Finefeuiaki's hip in the 31st minute at Suncorp Stadium on Friday.
Sent for a head injury assessment, the knock was originally ruled as a category two by the Roosters, before that was overruled by the independent doctor, who deemed it a category one.
That ruled Watson out of the game and triggered an 11-day stand-down that would keep him out of next Sunday's decider in Sydney.
But Robinson said post-game Watson was undergoing more tests, with the coach refusing to rule out seeking an exemption for the NSW Origin utility.
"That was a hard one; he came out as a category two, they changed it to a one after a couple of minutes," Robinson said.
"That's still 'watch this space' on Connor. It depends on how his tests go (if the Roosters appeal), so we'll see how that goes."
Robinson played down fears Victor Radley would be suspended after the England international was reported for a hip-drop tackle on Herbie Farnworth, arguing the Dolphins' centre was already on his knees.
The match swung when Mark Nawaqanitawase plucked an intercept that stopped a certain Dolphins try, the winger racing 90 metres to open the scoring against the run of play.
He went on to produce an incredible assist for Robert Toia that created a two-score gap early in the second half, and iced the contest with a rampaging effort for his second try on 56 minutes.
Sam Walker emerged unscathed after a record-equalling 27-day comeback from a syndesmosis injury to give a masterclass orchestrating the backline and set up a decider against Penrith or Newcastle.
Robinson will be angling for his fourth premiership win in as many attempts, having not reached a final since 2019.
"It's mostly internal, you want to get the most out of it," he said of the pressure to return to the big stage.
"I know what my role is and it hasn't panned out, but it's not about getting into a grand final, it's about winning it.
"That's pretty simple and that's what I'm here to do."
