SCOTLAND defender Kieran Tierney admits he is delighted to have put his frustrating four month injury lay-off behind him after making his second appearance for Arsenal in Thursday’s Europa League victory over Standard Liege.

The former Celtic left-back produced an eye-catching display in the 4-0 win after crossing for Gabriel Martinelli to head home the opener before having a hand in the next two goals.

The 22-year-old made his long-awaited debut in the September 24 Carabao Cup victory over Nottingham Forest after being sidelined by a groin complaint on the back of undergoing a double hernia operation during the summer.

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Tierney was left out of the Scotland squad for the upcoming Euro 2020 qualifiers against Russia and San Marino at Gunners manager Unai Emery’s request but the £25 million player is thrilled to be up and running at the Emirates.

He said: “It’s been a frustrating time being out injured but that’s what happens in football, you work hard and it’s all worth it for nights like Thursday.

“It’s hard, you would like to come and hit the ground running, play games but when you are injured you are a bit to the side - but the players and staff have been great with me and I could not ask for any more.

“I’m just doing my best every day. I work hard and if the manager trusts me then I’ll give 100 per cent.

“Coming here, the standard has been great for me to learn off, it’s taken me a few weeks to get up to standard and up to speed with the other boys. 

“They are a world-class standard and so for me learning off them is brilliant.

“I’m delighted to be here and Arsenal have shown great faith in me by putting in a record-breaking bid, so I’m delighted.”