New London Irish boss Nick Kennedy said the club know a big task awaits them as they try to make an immediate return to the Premiership.
Kennedy revealed that the club are under "no illusions" about their challenge in the Championship.
"It was a terrible year for us, there's no hiding behind that," Kennedy told the BBC.
"The rebuilding starts now, we've got a huge challenge next year."
Kennedy, who played over 200 matches as a lock for the Exiles, has replaced Tom Coventry after the club were relegated from Premiership the first time since 1994.
"There's no point rolling out a load of excuses now," he added.
"Ultimately, we weren't good enough and we're taking our medicine now.
"We were the worst team in the Premiership and now we're a Championship team."