Premiership champions Celtic were too much for Portimonese to handle as Brendan Rodgers' side secured a dominant 4-1 win ahead of their trip to Japan.
The Irishman watched on with pride as Reo Hatate netted from the spot before Liel Abada and Ben Summers netted either side of a strike from the hosts.
The Primeira Liga side were overmatched against their opponents who are gearing up for a fresh tilt at the Champions League under their returning manager.
And there was more to savour in the second period as Oh got in on the act to build on a free-scoring finish to his first six months in Glasgow.
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