Robins boss Steve Cotterill was left fuming with the officials after the game over the amount of added-on time that was played as the Premier League Baggies grabbed a last gasp equaliser against his Championship strugglers.
City held a 2-1 advantage at The Hawthorns as the fourth official held up his board showing there would be four minutes of injury time.
But after the referee allowed a Baggies free-kick to be taken in the 95th minute, James Morrison struck to earn Tony Pulis's men a replay.
'Game was over'
Cotterill told Match of the Day: "The game should have been over.
"We timed it from the second the four minutes went up on the board. Time was already up when West Brom had a free kick at the end.
With their Premier League quality, they don't need any favours, but the referee has allowed them to play on and put another ball into our box.
"I feel for our boys, because they were excellent and deserved to win."
Lawro has his say
But Liverpool legend Lawrenson has told the Robins boss and their fans to stop moaning.
"You know what, the great thing about it they've (West Brom) worked the goal," Lawrenson told MOTD.
"They didn't just lump it into the box, it's a sequence of four passes.
"I know Steve Cotterill said there was only five seconds (left) when they took the free-kick, but don't give the free-kick away."
After Pulis fielded a full strength team, including Tottenham Hotspur transfer target Saido Berahino, Lawrenson said the Baggies will be pleased to have earned a replay and spared their blushes.
With Pulis telling Cotterill he 'needs a new watch' in his post match press conference - as reported by the Birmingham Mail - it adds extra spice to the replay which will be staged at Ashton Gate next Tuesday January 19.