Walsall suffered their second defeat in three league games on Tuesday evening as they slipped to a two-nil defeat to title-chasing Barrow at the SO Legal Stadium.
Goals from Ben Whitfield and Niall Canavan saw the Saddlers make it six without a win as their opponents bagged their fifth win in as many games.
Speaking to the media shortly after full-time, Sadler, who is under increasing pressure as his team not only fails to perform but has also seen the goals dry up, admitted things need to improve, and quickly.
With the likes of Express & Star reporter George Bennett posing questions, Sadler said; "The first point of that is I am not one to tell them that they had no heart because I know they've got heart, I know they've got passion, I know they want to be successful as a group.
"The biggest thing for me is when it doesn't go well on this journey that we're on, what do you do next? How do you affect the next thing that happens?
"We have to get them back into a positive mindset quickly. That's the only way to improve things from my experience in football.
"We know we fell below what our standards are tonight, and we have to get better."
Source: Express & Star.