Northampton Saints centre Jon Clarke says that they must treat their Aviva Premiership defeat to Harlequins as a "wake-up call".
Saints were beaten 26-13 at The Stoop on Friday, having been narrow winners there last season.
Clarke told BBC Radio Northampton: "We gave them a lot of ball in our own half, we gave penalties away and we didn't kick to space.
"Maybe this is a wake-up call to how tough the league is."
He added: "The only positive is that they are things we can work on.
"We know the ability in the team and we know we can improve. It was one of those days when nothing went right.
"We have to take a good look at ourselves because we've got a massive game [against London Irish] next week."