Sheffield Wednesday boss Carlos Carvalhal was left frustrated by a controversial refereeing decision which led to the Owls being dumped out of the FA Cup at the hands of League One Shrewsbury Town.
With the score at 2-2, Atdhe Nuhiu appeared to be fouled in the box by Shrews defender Zak Whitbread, however referee Paul Tierney didn't budge and Jack Grimmer scored what turned out to be the winner moments later.
"It was a crucial moment in the last minute," said Carvalhal.
"You know that I'm a long time at the club and I never talk about referees, never talk about excuses, but of course when the score was 2-2 there was a moment that was a very clear penalty to Nuhiu and it can decide the game.
"I don't believe that anybody on the pitch saw something different than a big penalty, but the referee and assistants didn't see what everybody saw. Okay, you don't give a penalty and after a counter-attack Shrewsbury go 3-2.
"I must give congratulations to Shrewsbury, going to the next round."
Lewis McGugan twice had Wednesday in front, only for Carvalhal's side to be pegged back by Shaun Whalley and Jean-Louis Akpa-Akpro and deep in injury time, Grimmer scored the goal which sent the Shrews into the fifth round.
"I just think it was a terrific day for the football club," said boss Mickey Mellon. "We know how much this town loves its football and to feel the ground rocking like that.
"To have this club involved in games like this and challenging big clubs like Sheffield Wednesday to get into the fifth round of the FA Cup is what it always should be and we're very, very respectful of that.
"We try and make sure we give the fans these days, these afternoons and we're delighted to have been able to have done that."
Mellon was delighted for match-winner Grimmer, who turned 22 earlier in the week.
He said: "People are asking for attacking football so I can't do any more than my right-back getting on the end of a cross in the 97th minute. I'm delighted for young Jack - he's a fantastic guy.
"As soon as I saw Vernon going up that left-hand side, he's such a technically good footballer, I actually was commentating.
"I knew he would get a cross in the box and I just thought 'somebody get on the end of that' and bang, I was delighted, and the whole place just explodes, so it's fantastic."