The Hammers have made a strong start to the 2015-16 Premier League season and find themselves third in the league table at the moment.
There is a buzz around the Boleyn Ground and the fans are hopeful of a top-half finish at least, but Keys has suggested that things may not go according to plan.
“If Chelsea have been toiling because they came back late in the summer is there anything in my theory that the Hammers are flying right now because they've been back playing since July 2?” the former Sky Sports presenter wrote on his website.
“They had 12 games behind them by the time the season kicked off. If there is, I suspect they might run out of steam before anybody else. We'll see.”
West Ham did indeed start their season in July as they were playing in the Europa League qualifiers, but that is not going to affect them in the coming months.
The main reason is that manager Slaven Bilic did not use his strongest lineup in those matches and left out some of his key players.
Moreover, the likes of Michail Antonio and Victor Moses signed on transfer deadline day, while attacking midfielder Manuel Lanzini arrived in late July.
It is unlikely that West Ham will be able to retain their place in the top four of the Premier League table for long, but it will be a surprise if they collapse dramatically.