Steve Bruce's side have slipped to 13th in the Premier League, four points off the relegation zone, after losing four league games in a row.
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"I think we need to be concerned because this has gone on too long now," he told the club's official website.
"We beat Fulham 6-0 and have done nothing since. Those 6-0s are all very well but I would have happily taken a couple of 1-0s along the way to be further out of sight.
"We need to get it right and our next game is against Tottenham. That is the only place to put it right - the next game.
"We're going to have to work at a game plan to stop their flowing, attacking football and look at how we can score a few goals because, if we're not scoring goals, we have nothing to hang on to."
Hull have played Spurs twice already this season, losing at White Hart Lane 1-0 in the Premier League and suffering a penalty shootout loss in the Capital One Cup three days later.