Gerald Wallace takes issue with the Celtics’ preseason effort

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MONTREAL — Gerald Wallace is the most senior member of the Celtics, with 12 years of NBA experience on his resume. So when the veteran swingman speaks, his words carry weight in the locker room.

And Wallace was not at all happy with how his team played in a 104-89 preseason loss to the Minnesota Timberwolves at the Bell Centre Sunday, a game that was part of the NBA Canada series.

It was the Celtics’ sixth loss in seven preseason games. They have one exhibition game left, Wednesday against Brooklyn at TD Garden, and their regular season opens Oct. 30 against the Raptors in Toronto.

“We’re not playing with effort,” Wallace said.

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