Tony Pulis says it's "absolutely ridiculous" that the "chaos" of the transfer window is going on when the season has started.
Fourteen Premier League clubs voted to close next summer's transfer window early, with it now being shut at 17:00 BST on Thursday before the 2018-19 season.
Managers complained that signing players once their campaign has begun causes disruption to their squads and preparations with Pulis one of those in favour for the change.
"It's absolutely ridiculous," the West Brom boss said. "I don't think it benefits anybody that you can still have all this chaos going on when the match programme has started.
"I would have closed it a week before the season to stop all the rigmarole going on. It stops all the speculation while you're running and playing games, so I'm very pleased that they've decided to take that decision.
"There's talk that the German Football Association are going to follow suit and I hope that the other countries will do the same," he added.
The window across Europe runs until August 31 and with the Premier League's move, it means while clubs will be able to sell until that date, buying activity will cease on August 9 for the 2018-19 season.
Whereas, European leagues will still be able to buy and sell until August 31, while the Football League's window also remains unaltered.
Bournemouth manager Eddie Howe has been amongst some of the managers that have welcomed the change.
"I think it's good news," he said. "It won't be plain sailing but overall I think it's healthy for the team.
"It was never a clear cut 'yes' or 'no' there was much to debate and there will be many pitfalls, but I'd rather the challenges it will bring, than the uncertainty in the squad," he added.
Cardiff City's Neil Warnock added: "It's a great thing for managers. Before, it only helped the big clubs really and now the lower clubs can just get on with it. I think it's a bit of a leveller as it now helps the lesser clubs."
Football League bosses have indicated they could follow the Premier League's move but require further discussions with stakeholders before a final decision is made.