Richard Arnold has vowed Manchester United will be relentless in their efforts to arrest the team's drastic decline.
United ended a fifth consecutive campaign trophyless and fell from second to sixth when they were recognised as would-be title challengers at the start of the season.
Former manager Ole Gunnar Solskjaer was sacked in November and the club suffered FA Cup fourth round and Champions League round-of-16 eliminations under interim manager Ralf Rangnick.
