Everton beat the Premier League's bottom club Norwich to return to winning ways and move within touch of the Premier League's top four.
And there were more murmurs around Goodison Park as Norwich pressed for an equaliser in the second half.
But Doucoure's strike keeps the Canaries waiting for their first point since securing an immediate return to the Premier League.
And in a sequence that includes the last 10 games of the 2019-20 season, manager Daniel Farke has now suffered 16 consecutive top-flight defeats.
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