The Potters boss tuned in to watch Roy Hodgson's side take on Poland in Warsaw in case Shawcross made his senior England debut, but heavy rain over the Polish capital and an unclosed stadium roof caused a waterlogged pitch, with the match being rescheduled to 5pm local time on Wednesday.
"I hadn't watched the build-up and just switched on to see the kick-off and couldn't believe what I was seeing," Pulis told the Sentinel. "You can't believe that if they have a roof and the rain is coming down they haven't prepared for it. But you can't do anything about it now and I've got no worries about Ryan ahead of Saturday."
Despite the upheaval, Pulis is hopeful Shawcross will be able to report for training on Thursday.
Stoke face Manchester United at Old Trafford on Saturday and the Potters manager is not worried about a lack of preparation ahead of the clash.
"We're training in the afternoon rather than the morning, so that gives him a bit of extra time," Pulis said.
"In the old days they used to play internationals on the Wednesday anyway, so it's nothing new really.
"And with Saturday in mind, I suppose you could look at it we've got one player out there and United have got four."
Source: PA
Source: PA