Former Manchester United star Gary Neville believes his old club must keep Wayne Rooney and not sell the England star to Premier League rivals Chelsea.
Rooney, who has been the subject of two bids from the Blues, has been at the Red Devils since 2004 when he joined the club from Everton.
And his former teammate Neville is adamant that David Moyes cannot afford to let him leave the club unless a key signing was made to replace him.
Neville told Sky Sports: "Manchester United cannot sell Wayne Rooney to Chelsea Football Club - unless they bring in a major, major signing like Gareth Bale or Cristiano Ronaldo.
Neville, whose brother Phil is on the coaching staff at Old Trafford, believes Rooney's importance to United shouldn't be underestimated and he is still crucial to the side on the pitch.
"You have absolute gold in Rooney, someone who is proven over six, seven, eight years; who delivers season in, season out; and is one of the top goals and assists man in the league consistently - even last season when he wasn't at his strongest.
"He will work his backside off and never drop his level in training and the importance of Rooney [is huge]; he is a vital player, a champion player and someone that wins you the league.
"He is the guy who in the middle of October when you are four points behind in the league, going to Chelsea and have Arsenal the week after, sits in front of his midfield two, works his backside off, gets up the pitch, gets back, sets up goals and digs in.
"Don't underestimate the value of Rooney to Manchester United's success over the last eight years and the way he is liked amongst his team-mates.
"Manchester United do not need to sell him for the money and I don't think they will sell him at all - and if they do, not until they bring in a decent replacement."
Rooney currently remains sidelined with a minor shoulder injury, however has made the England squad that plays Scotland next week.
United will be hoping the star will be fit for their opening Premier League game of the season as the Red Devils travel to Swansea City on August 17.