He had one season as United's regular goalkeeper, but then they signed the French World Cup winning goalkeeper Fabien Barthez in June 2000. Soon after, Bosnich found himself as third-choice goalkeeper. Newly appointed Celtic manager Martin O'Neill made an offer to loan Bosnich for the 2000–01 season, but he decided against the move and decided that he would try and regain his place in the Manchester United first team. He had also fallen out of favour with the national side, losing his spot to Mark Schwarzer. With hopes of a first team return fading Bosnich was linked with Chelsea.