O'Neill conceded he "didn't know anything" about Osmand until a week ago, but he has hailed his "excellent" contribution since.

"The young man is very sharp," the interim manager added. "He wants to get a couple of DVDs on Henrik [Larsson] - that would help.

"He's got plenty of confidence, he was arguing with everyone at the end."

Former Celtic boss Neil Lennon described Osmand as "something a little bit different".

In a vibrant and influential showing at Hampden, the Welshman had five shots and picked up a yellow card for a foul on Rangers captain James Tavernier.

His goal came with his fifth effort, a first-time finish between the posts following a low cross from the left by Kieran Tierney.

In the build-up, the youngster's intense pressing helped Celtic regain the ball in the final third when he dispossessed Joe Rothwell.

That kind of drive has been missing from a Celtic side that have failed to score in six games this term and have netted fewer league goals than Heart of Midlothian, Hibernian and Dundee United.

But with seven goals in their past two games under O'Neill, and young...