Gary Neville believes Manchester United have struggled to get their business done this summer because other clubs are taking advantage of their situation in the transfer market.
United went into the window with the intention of strengthening Ole Gunnar Solskjaer's squad in several positions after a disappointing end to the season but have made just one addition so far.
Neville also believes United will have their work cut out to land their top targets because there are numerous other clubs interested in signing them too.
"It's difficult to do business, it's not easy," Neville told Sky Sports. "Everyone knows Manchester United want players and price tags will go up.
"You've got to try and encourage players to come to the club. Players don't just jump to sign for any club - they do their homework and get their agents to get to work.
"They probably have 50 meetings before they sign for a club nowadays. Manchester United will be in the pit with the rest of the sharks looking for the big signings. It's difficult for all clubs they all want the same players. They all want Harry Maguire, every single club wants him. Everybody wants Christian Eriksen."
Neville added that this summer should be as much about getting rid of the players that are not up to scratch as it is signing new ones.
"Players that are being bandied about, there are four or five clubs in for them," Neville said. "They aren't just going to sign for the first club, they'll choose wisely and look at the different aspects.
"Manchester United have got a big job to do in order to get a squad right for a championship challenge. Hopefully that'll start this summer but it's not just bringing players in, it's about getting some out."
