Roberto Soldado and Erik Lamela were among the goalscorers as Tottenham thrashed Celtic 6-1 in Saturday's friendly in Helsinki.
Spurs raced into a 2-0 lead thanks to efforts from frontmen Harry Kane and Soldado in the fourth and 11th minutes respectively.
Jamie Lindsay pulled a goal back for Celtic in the 43rd, but a minute later Lewis Holtby restored the two-goal cushion and Tottenham kept the momentum going after the break.
Midfielder Lamela - who, like Soldado, is looking to bounce back after a disappointing first season with the London club - made it 4-1 just before the hour mark.
And a Christian Eriksen free-kick and Emmanuel Adebayor penalty wrapped up the rout in the last 10 minutes, while Celtic's misery was compounded by a red card for Efe Ambrose - his second this week, having been dismissed in Wednesday's Champions League qualifier against Legia Warsaw.