The Hibernian frontman is reportedly poised to sign for Gordon Strachan's side on a free transfer, having turned down a new contract at Easter Road.

Killen was on the verge of agreeing a transfer to Cardiff earlier this week, however his head has apparently been turned by interest from Parkhead.

New Zealand manager Ricki Herbert claims Killen, 25, could be a big hit for Celtic.

Herbert said: "If it works out it would be absolutely fantastic - it would be outstanding.

"When you look at Killy's career it's onwards and upwards for him and still at quite a young age.

"Celtic are not only in the top echelon in Britain but they're also a hugely recognisable club around the world. It's a great platform for him - who knows where it will lead."