The Mercedes driver made the humorous jibe as he discussed a wet FP2 in Montreal, after running second-fastest behind team-mate Lewis Hamilton.
Ricciardo, currently a reserve driver for Red Bull, is on the pit wall this weekend with the team.
Russell told F1 reporter Lawrence Barretto: “It’s obviously been a bit of a strange day with what happened in FP1 and then the extension of FP2. It was a reasonably productive session; I don’t think we can read too much into the timings.
“We did our low fuel qualifying prep towards the end of the session when the track was quicker. It’s bumpy.”
He then made the joke about Ricciardo, noting that he ‘stuck his finger up at me’.
Russell said: “There was a rogue Australian fan in the pitlane as well, at some point.
“I don’t know what it was, but he stuck his finger up at me or something when I was waiting to go out – it was around the Red Bull area. I need to check the video [and] see if an investigation should go into this.”
Barcelona v Montreal
Russell also discussed the key differences between the Spanish and Canadian Grands Prix as he looked ahead to tomorrow’s race.
He said: “Between Barcelona and here, they’re two totally different circuits. Barcelona [is a] super smooth, high-speed circuit.
“Here, it’s incredibly bumpy, but I do think the upgrades we brought to the car in Barcelona have helped [with] the limitations that we probably would’ve had more of with the old specification of car."
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