CHARLOTTE, N.C. -- Carolina Panthers coach Ron Rivera is tired of losing close games -- and he let his players know it during Monday's team meeting.

"It's time," Rivera told reporters Monday, less than 24 hours after a 24-23 loss to the Buffalo Bills. "It really is. It is time for playmakers to make plays when they've got opportunities.

"It's time to be in good position to where you close things out to where you don't have to worry about the last drive, the last second. That's what we talked about."

Buffalo drove 80 yards with no timeouts and scored the winning touchdown on a 2-yard pass from rookie quarterback EJ Manuel to a wide-open Stevie Johnson with two seconds left Sunday.

It was the 10th time since Rivera was named coach in 2011 that Carolina lost a game it led going into the fourth quarter. That is tied with Philadelphia for the league's worst mark during that stretch. San Diego, Tampa Bay, Detroit and Cleveland are tied for second with seven.

The loss was the 14th in 16 games for Rivera in contests decided by seven or fewer points. The result is a 13-21 overall record that has Rivera's future in question.

Rivera said he has had no conversations with team owner Jerry Richardson and that he is not concerned about his job security heading into a Week 3 game against the winless New York Giants.