Erik Lamela was “lucky” to receive a second yellow card rather than a straight red card for his elbow on Kieran Tierney in Tottenham v Arsenal on Sunday.
Speaking exclusively to Football Insider, the former Premier League and FIFA official claimed Michael Oliver would have warned Lamela about his discipline but this was ignored.
The Argentina international was already on a booking when he fended off Tierney with a raised arm while dribbling.
It came just seven minutes after his first booking for a late challenge of Thomas Partey.
Lamela had an extraordinary afternoon at the Emirates. After being introduced from the bench in the first half, he scored a rabona goal to open the scoring.
Arsenal came from behind and scored twice before Lamela was given his marching orders.
Asked for his assessment of the sending off, Hackett told Football Insider correspondent Connor Whitley: “If referees prepare and prepare well, and they’re alert, they might have been aware of a player losing a bit of self-discipline.
“A quiet word with a player can prevent an escalation of a problem, but with some players… He’s scored a fantastic goal, but he’s illegally used his arm in a stupid manner. There’s no question, you can’t defend it.
“Absolutely, it could’ve been a straight red. I can see the justification for a red.
“He’s lucky to get a one-game ban, rather than a three.”
Lamela will miss Tottenham’s visit to Aston Villa next Sunday but will be available for their Europa League game on Thursday.
If he received a straight red card, he would also miss games against Newcastle United and Manchester United.