The Chelsea boss donned a tracksuit for the with Burnley clash on the opening weekend of the season, a game the Blues lost 3-2.
But he ditched the casual look in favour of a suit yesterday for the 2-1 win over Tottenham.
And Keys has supposed it could all be due to someone whispering into his ear about not upsetting owner Roman Abramovich.
Writing in his personal blog, Keys said: “The crisis at Chelsea certainly didn't last long. Conte made his point last week - dressed in his tracksuit as though he was simply 'the boy' on the touchline.
“This week it was collar and tie again, almost as though somebody had whispered quietly in his ear about not taking the mickey out of the owner.
“Conte's team were terrific - they went to Wembley with a plan and executed it brilliantly.
“They were a totally different team to the one that Burnley took apart on the opening day.”
Marcos Alonso scored twice as champions Chelsea beat Tottenham in their first Premier League game at Wembley.
Keys thinks the troubles at home could be a trend and said: “So two games in Spurs have a better away record than they do home - just as we predicted.
“Of course it's far too early to draw any kind of conclusion from that statistic, only that it highlights what we said was likely to be the case - and that is that teams will love going to play them at Wembley.
“Conte said as much after Chelsea's win. Having said that, I thought Spurs played well and as Ray Wilkins would say 'were a tad unlucky!’”