Although the champions equalised twice through Rooney to draw 2-2, England defender Smalling confessed they had boobed.
He said: "Obviously you try not to jump too much, but he got it underneath us, so we'll have to look at that.
"It was such a disappointing way to concede. We're supposed to jump only a little bit, enough to give us a few extra inches in height but not enough so the ball can go underneath us."
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