Manchester United assistant boss Phil Neville says the club's home form was central to a "disastrous" first season under David Moyes.
United suffered seven home league defeats in the 2013/14 campaign, leading to their worst-ever finish in the Premier League era, with Moyes sacked in April after it became mathematically impossible for the club to qualify for the Champions League.
And Neville says that after early season home defeats to the likes of West Bromwich Albion and Everton, United became increasingly vulnerable on their home patch.
"It's been a disaster really," Neville told talkSPORT. "The results and our home form has probably cost us. To lose that many games at home, Old Trafford has been a fortress [in the past] and it's not been this season.
"Teams have been coming and the more defeats we've been having, teams have been more confident. It was obviously going to be a massive transition after Sir Alex Ferguson's tenure and it's just not worked out right.
"There is no-one more disappointed than me. David Moyes brought me in and he's lost his job now. I managed to stay on and now with a new manager coming in we've got to make sure that United are back to challenging for league titles again."
Although Louis van Gaal is likely to be confirmed as United's new manager imminently, the future of interim boss Ryan Giggs as well as coaches Nicky Butt and Paul Scholes is still to be decided.
Van Gaal's appointment has been constantly delayed as he continues to prepare Holland for the World Cup finals in Brazil and as the wait goes on, Neville's future at the Theatre of Dreams remains uncertain.
"It's that period now where we're waiting for the next manager to be named and then our positions will become more apparent," he added. "There is nothing to report.
"I was asked when David Moyes was sacked to carry on for four more games with Ryan as interim manager and they would let me know my future at the end of the season so hopefully over the next week to 10 days we will know."