“Grab the goalie, take him to the front post and we’ll deliver the ball to the back. From that point of view it has worked for them.
“It can’t be allowed otherwise I’m standing in the right half of the goal and probably save the second header.
“If you are allowed to rugby tackle the goalkeeper and play on, then that’s a different game than what I’m used to.
“It puts us 2-1 down and we’re very annoyed in both instances that the goals have been allowed. I was talking about how difficult it is to win trebles and we turn up today, we get a few decisions against us and that’s what happens.”
Schalk added a third while a missed penalty from Leigh Griffiths ending Celtic’s hopes of claiming a domestic treble this season.
And shotstopper believes Dutch striker Schalk was cute as he won the penalty that brought his side back into the game following Gary Mackay-Steven’s first minute opener.
He said: “The boy [Schalk] has gone through and he’s overrun the ball a little bit and he’s actually ended up getting something better than a goal with the sending-off and a penalty.
“It ends up with a goal and we’re down to 10 men. I think he’s looking for it, it’s clever striking play and I think that’s exactly what he wanted and he got it.
“There wasn’t a great deal of contact, but if you go down then it’s very difficult for the referee to see when he’s behind it whether there is any contact or not.
