Sunderland boss Paolo Di Canio is angry with some of his players after their display against FC Midtjylland.
Adam Johnson's early winning goal was a rare highlight.
He said: "That was not the performance I wanted to see.
"I would have preferred to lose and see a better attitude and improvement in our play, rather than win and take a step back from our play in Hong Kong.
"I didn't enjoy it because I expected a bit more from some of my players.
"I have to make sure they change their mentality, otherwise we have a problem."
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