Santi Cazorla grabbed a camera and snapped a 'selfie' with Aaron Ramsey, while the rest of the squad began a tour of the Wembley turf, accepting the supporters' plaudits on a lap of honour.
But Keane felt the fist-pumping Gunners went a step too far during their champagne moment.
"We have been critical that they have not been able to win ugly games and they have done that today.
"But to say they showed character? I have seen them enough times this year to say they have not done enough of that.
"They’ve beaten a Championship side in the semi-final on penalties.
"I think they need to relax a little bit and celebrate if they win the final."
For breaking stories and all the great banter like us on Facebook: facebook.com/tribalfootball