The midfielder was sent off against West Brom for pushing Claudio Yacob in the back of the neck.
Stoke host Liverpool in the a semi-final first leg on Tuesday with Cameron looking at a three-match ban if the Potters fail to get his dismissal overturned.
Hughes said: “We’ll have a look at that and decide whether or not to appeal but I think it’s likely. It was unfortunate. I thought Geoff has reacted to a late challenge on a leg he injured in the first half. It is understandable to a certain extent.
“We weren’t too happy with the reaction of the lad Yacob to be perfectly honest. I thought he has gone down with the intention of maybe getting Geoff sent off and unfortunately for us that’s what he’s able to do.”
Jonny Evans capitalised on Cameron’s card when he scored in stoppage time to give boss Tony Pulis a third straight win over his former club.
Jonathan Walters had equalised just two minutes before Cameron’s 83rd-minute dismissal to cancel out Stephane Sessegnon’s opening strike.
Hughes felt the late red played a huge part in Evans’s injury-time winner.
“At setplays you are one man down and they are throwing everyone forward. At some point there is someone free. We could have done better to clear the chance, it’s bobbled across and ended up in the far post for the tap-in. We certainly didn’t play anywhere near like we’re capable of.”
Meanwhile, Darren Fletcher has told Saido Berahino to follow Stephane Sessegnon’s road to redemption at West Brom.
Sessegnon scored his first Albion goal since October 2014 in Saturday’s win.
Berahino was a substitute for the ninth straight game, only coming on as a late substitute, as his struggles this season continued.
Sessegnon was in exile at Albion at the end of last term, missing their summer tour of the United States, and only made his first league start of the season in October.
However, after his performance against Stoke, Baggies captain Fletcher believes Berahino can learn from Sessegnon.
He said: “Saido is here and a part of a squad and is well-liked. Sess is an example to everyone. It is (a fuel) to everyone. Saido is a great kid who is not in the team right now but he’s got to keep his head down because he’s a great talent and he’s got a number of years to play.
“This might be a good learning experience for him.”
Myhill, Dawson, McAuley, Evans, Brunt, Fletcher, Yacob (Berahino 85), Sessegnon, Morrison, Gardner (McManaman 90), Lambert.
Chester, Pocognoli, Gamboa, Lindegaard, Roberts.
Butland, Johnson, Shawcross, Wollscheid, Pieters, Cameron, Whelan (Walters 68), Shaqiri (Adam 85), Afellay, Arnautovic, Krkic (Joselu 64).
Wilson, van Ginkel, Crouch, Haugaard.