Former Manchester United goalkeeper Roy Carroll has warned Red Devils boss David Moyes that patience will soon wear thin at Old Trafford without success, particularly when the plight of rivals Arsenal and Liverpool in terms of a barren trophy run.
Carroll spent four years Man United and is acutely aware of the pressure to win silverware every season, an expectation Moyes must meet to be a long-term hit as Sir Alex Ferguson's successor.
The Northern Irish stopper is now at Olympiakos and saw first-hand United's struggles in the Champions League last week, with the Greek champions claiming a 2-0 lead in their last 16 tie thanks to a lacklustre performances from Moyes' men.
With the bid to defend their Premier League title effectively over Carroll believes Moyes must win a trophy next season to keep United fans onside, with a number one priority avoiding a prolonged spell without success currently being endured by rivals Arsenal and Liverpool.
Carroll told the Daily Star: "They haven't changed too many players from the side that won the league but David Moyes has had a tough start.
"He seems like a nice guy so I hope he does well - but the fans will have to be patient.
"I just don't know how patient United fans can be because they don't want to do an Arsenal and not win a trophy for that long, or be like Liverpool and go without winning the league for so many years."
Moyes needs to keep alive fleeting hopes of Champions League success by turning things around against Olympiakos in the second leg at Old Trafford, as United aim to overhaul a two-goal deficit.
Carroll will take no part in the tie against his former club though, with the 36-year-old not registered for European competition.