In a post-match interview with Sky Sports, Postecoglou reminded the interviewer he 'always' wins a trophy in his second year at a club.
However, Merson disagreed.
'I like Ange, I like him, but I've got more chance of winning Strictly', Merson said on Sky Sports.
Host David Jones cheekily revealed he'd seen some of Merson's dance moves, which was 'not great news for Spurs'.
Paul Merson does not think Ange Postecoglou has much of a chance of winning a trophy
Merson doubled down on his brutal verdict on Postecoglou and Tottenham as he compared the club with Newcastle's progress.
'No, I don't see it at the moment,' Merson said.
'There's not a lot wrong but you look where they are and where Newcastle are. Tottenham have probably been playing better than them over the first three games and Newcastle have more points than them.
'If they get top four - brilliant. Honestly that would be amazing but 100 per cent, it would be amazing but they'll need to get Solanke to get 20 odd goals and they can only get 20 odd goals if the crossing improves.
'If the crossing don't improve, you can put Haaland up there and it wouldn't improve.'
Unsurprisingly, Merson was nowhere near as critical of Arsenal as he was Tottenham.
In fact, Merson remains adamant the Gunners have 'every chance' of breaking Manchester City's stranglehold and win the Premier League this season.
'They’ll be full of confidence,' Merson said.
'Everyone in the Premier League will have been watching today. The whole of the PL. Missing Odegaard, missing Rice. Two big big players.
For me now this is a heads or tails. This league is a heads or tails this year. I always thought who’s going to beat Man City over 38 games. I’ve seen enough today that Arsenal will be there.