As reported by,

Aberdeen’s Sam Cosgrove, left, and Kristoffer Ajer in action

Sam Cosgrove was frustrated the Dons couldn’t show what they were capable of against Celtic after ending the Scottish Cup semi-final with nine men.

Aberdeen were beaten 3-0 by the Hoops at the national stadium as their hopes of lifting the Scottish Cup for the first time since 1990 were abruptly ended.

Dom Ball was first to be sent off near the end of the first half.

The Rotherham loanee collected a second yellow card following a clash of heads with former Red Ryan Christie, after a harsh booking for a trip on former Don Jonny Hayes.

In the six minutes of injury-time at the end of the first period – added because of Christie’s treatment – James Forrest fired Celtic in front.

Just after the hour Odsonne Edouard’s penalty made it 2-0 and then referee Craig Thomson gave Lewis Ferguson a straight red card for a two-footed lunge on Tom Rogic.

Dons boss Derek McInnes and assistant Tony Docherty were also sent off – with McInnes dismissed after Rogic netted the Hoops’ third.

Striker Cosgrove was disappointed that the red cards for Ball and Ferguson suffocated any hopes of Aberdeen mounting a second-half comeback.

The Englishman, 22, said: “The first emotion that comes to mind is frustration and then annoyance.

“We came to Hampden knowing it was going to be a tough day and I’m sure Celtic expected the same. But when we go down to

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