Norwich City's slide down the Championship table has become a major concern, says boss Neil Adams.
The Canaries were top in mid-October but, after Tuesday's 4-0 hammering at Middlesbrough, are now seventh.
When asked how concerned he was by his side's form, Adams told BBC Radio Norfolk: "Hugely, of course."
He added: "It doesn't matter how well we think we're doing. If we're going to concede goals in the manner we did then it's going to be really tough."
City have won just two of their last nine league games, taking 10 points from a possible 27.
But they remain just four points off the top of the table and face Nottingham Forest on Saturday, a team who go into Wednesday's visit of Brentford winless in nine games.
|Hit and miss|
|After scoring 20 goals in their first nine Championship games this season, Norwich have managed just four from their last seven|
"You don't make decisions now, but of course, after a heavy defeat and a performance that isn't good enough, we'll certainly be thinking about changes," said Adams.
"We've got a massive game on Saturday against a team that will probably be rubbing their hands together.
"They need points as well and we have to be better."