Fair point, I can't claim to know all that much about him, or Celtic's European form, first hand. But I'd trust Martin and he is the only one involved that has spent a year coaching both players.For every VVD and Wanyama theres a Jelavic and Goodwillie. Or Aribo even!
Could also argue that those two performed well in the CL also at a time when Celtic were okay in Europe. Not 100% but haven't they been ****e in Europe in recent seasons?
and Aribo may yet come good!