Ange Postecoglou got a harsh reintroduction to the Premier League with new team Nottingham Forest as Arsenal’s new signings Martin Zubimendi and Viktor Gyokeres combined to secure a 3-0 win on Saturday.

Zubimendi, the Spain defensive midfielder recruited from Real Sociedad, volleyed home spectacularly from the edge of the area in the 32nd minute to put Arsenal in front before Gyokeres tapped in a cross from Eberechi Eze — another summer signing — to double the lead inside the opening minute of the second half.

Zubimendi headed in the third in the 79th minute to complete a miserable return to English soccer for Postecoglou, the former Tottenham manager who was hired by Forest on Tuesday as a replacement for the fired Nuno Espírito Santo.

“This week, it’s fair to say, was fairly disruptiv

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