Eddie Howe said the buck stops with him after his Newcastle United side conceded two late goals in a 2-1 Premier League defeat at Crystal Palace on Sunday that saw them drop to 14th.
Newcastle led through William Osula's hooked finish shortly before halftime but Palace substitute Jean-Philippe Mateta scored an 80th-minute equaliser before converting a stoppage-time penalty.
"I always have to look at myself first. I always say that. I'm number one accountable," Howe said.
"There's no way we should have lost that game. We had a younger team today, but that's no excuse. There's enough experienced internationals on the pitch to navigate the defensive aspect well enough."
Newcastle have now dropped 25 points from winning positions this season, and Howe was frustrated that his players were not finishing teams off.
"Those numbers are incredible. It's blighted our season," he said.
"The fact we haven't been able to consolidate really good passages of the game, but also to go on and score more goals and continue to attack. That's not the tactical instruction we give the players."
Carlos Alcaraz will miss the Madrid Open for the second consecutive year after withdrawing on Friday with a wrist injury, dealing another blow to the world number two's clay court preparations ahead of his French Open title defence.
Novak Djokovic is still working through the injury problems that forced him to miss recent tournaments in Miami and Monte Carlo and said on Friday that he will not feature at next week's Madrid Open, one of the last stops before the French Open.
Mumbai Indians head coach Mahela Jayawardene has defended Jasprit Bumrah after the struggling pace spearhead went a fifth Indian Premier League match without a wicket in Thursday's seven-wicket defeat by Punjab Kings.
Iranian women's football players Fatemeh Pasandideh and Atefeh Ramezanisadeh thanked the Australian government on Friday for offering a "safe haven" and said they wished to resume their sporting careers after rebuilding their lives.
Ollie Watkins still has hope of making England's World Cup squad despite being dropped for last month's friendlies against Uruguay and Japan, with the Aston Villa forward saying all he can do in the last few weeks of the season is score goals.