Louis van Gaal's Manchester United side have underachieved this season, says former chief executive David Gill.
Saturday's 1-0 home loss to Southampton - United's sixth defeat of the campaign - leaves them five points behind fourth-placed Tottenham in the table.
There were loud boos from fans after the final whistle at Old Trafford.
"We all hoped results would be better," Gill, who is on the board of directors at the club, told BBC Radio 5 live's Sportsweek.
"I know everyone at the club is working hard to turn things around. We have to stick together."