Armstrong insists Celtic cannot see red on derby day at Hampden

STUART ARMSTRONG last night warned Celtic they will need to maintain their discipline in the white-hot atmosphere of the William Hill Scottish Cup semi-final against Rangers on Sunday in order to triumph.

Ronny Deila’s side has been defeated in the last two semi-finals they have played at Hampden against Inverness Caledonian Thistle and Ross County – after having players sent off in both games.

The Parkhead club was leading the Scottish Cup semi-final against Caledonian Thistle 1-0 last year after an early goal by Virgil van Dijk and appeared to be heading for a comfortable victory.

However, goalkeeper Craig Gordon was red carded for bringing down Marley Watkins in the second half and his teammates, who were aggrieved not to be awarded a penalty following a Josh Meekings hand ball, ended up losing 3-2 after extra-time.

That painful and hugely controversial defeat scuppered the Scottish champions’ hopes of completing what would have been only the fourth domestic treble in their 127-year history.

Celtic suffered further heartache at the National Stadium in the League Cup semi-final this January when they crashed to a shock 3-1 loss to Premiership rivals County.

They took the lead through Gary MackaySteven in the very first minute, but centre half Efe Ambrose received his marching orders in the first half and they ended up losing 3-1.

There has been enormous hype surrounding what is only the second Old Firm match in four years and a crowd of around 50,000 is sure to generate an intense atmosphere inside Hampden.

Armstrong, the former Dundee United midfielder who is hoping to get the nod to play in his first Glasgow derby match, knows it will be vital for the Celtic players not to fall foul of referee Craig Thomson.

“I wasn’t involved in the Inverness g a m e [Armstrong was cup tied], but the Ross County game was obviously disappointing,” he said. “But circumstances were difficult in that game with the sending off. We had a great start and it petered out. We just need to focus in this one.

“I can imagine that maybe it hots up a little bit with people’s tempers. You need to keep calm and keep discipline and don’t get carried away.” Friday, 15th April, 2016