The Canaries succumbed to a 1-0 defeat at the hands of Stoke on Saturday, leaving them six points above the relegation zone with three games to play.
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"It's in our hands," he told the club’s official website. "If you start worrying about what other teams have done, that could be the problem because you're relying on other people. We just need to concentrate on ourselves.”
The defeat to the Potters extended Norwich's run to just one win in their last nine league games, but Howson believes the team have made a marked improvement this season under manager Hughton.
"We've changed our style of play this season and been a bit more solid and you can see that, but we had a lapse in concentration and that's cost us," he added.
"We knew they'd be a little more direct and for the large part of the game we have dealt with it. But the moment we didn't do too well, they got the goal. That's what happens at this level.”