Whelan escaped punishment for a two-footed challenge on Garcia in the 47th minute of the FA Cup fourth-round tie.
Webb took no action, not even awarding a free-kick for a tackle ITV analyst Andy Townsend described as a "red card every day".
Gareth Barry: "I think the referee said at the time - I spoke to him and he said he didn't have the right angle on it but Javi, in the changing room, said the player went in with both feet and caught his ankle so I think they showed that on TV too.
"I think there is a case. I think it's the rule now that if the referee doesn't see it but reports it, then they can have another look at it.
"But I don't want to speak badly against Glenn Whelan. He's a great pro and I'm sure he went for the ball.
"Losing Vincent Kompany was a little setback, mid-game, especially against a side like Stoke. Vinny's a big loss, but the lads who've come in have done a great job.
"I think his calf has been niggling him for a little while so this was one game too far.
"It's not ideal, so he'll have to have a scan and see how long he'll be out."
Source: Manchester City MAD