John Hartson has called on Adam Idah to display a 'better attitude' following his appearance during Celtic's defeat to St Johnstone.
The £9m striker has endured a disappointing season on a personal note, working under Brendan Rodgers.
He has played his part for the Scottish Premiership champions in the waiting - scoring 14 goals in all competitions.
However, the vast majority of his appearances have come from the bench, with Daizen Maeda fancied through the middle ahead of him despite Kyogo's January departure.
Idah was thrown on for the final half an hour at McDiarmid Park on Sunday, as Simo Valakari's side emerged with an unlikely 1-0 win.
"He doesn’t normally (play Maeda and Idah together)," Hartson told Go Radio's Football Show. "Brendan’s formation doesn’t change a lot. Sometimes when he is chasing a game.
"He doesn’t very often go with the two up, unless you are chasing the game, like they were against St Johnstone.
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"I thought Idah come on and I thought he was poor. I think he needs to do more. He comes on, and he has to get a grip of it. He has to be a bit more of a leader. Get it into me. Give me the ball. Get it wide.
"It’s almost like he comes on, and I just thought he went through the motions. And I like Adam Idah. I think he has something to his game.
"But, against St Johnstone, it’s almost like he comes on and it’s like he just comes on. You have to want to come on. A better attitude to make an impact in the game."
