LOUIS VAN GAAL faces a "massive" two weeks before the transfer window slams shut, according to Gary Neville.
There is just a fortnight of trading left and Manchester United remain active in the market.
Five new players have arrived so far this summer and they hope to secure their sixth in the coming days.
Ed Woodward flew to Barcelona yesterday in a bid to close out a deal for Pedro.
United legend Neville wants to see even more incomings due to the uncertainty over David De Gea's future and their lack of strength in depth at the back and in attack.
And he believes the next 14 days could go a long way to defining their season.
"It's still hovering on with this situation regards to the transfer window," he said.
"They could be in a position where they've got one centre forward, potentially not got the best goalkeeper if he moves off to Real Madrid, and they could - if they get an injury to a centre-back - Phil Jones is out at the moment - they could need another centre-back. That's the three main positions on the pitch.
"They look weak up front with Wayne Rooney and Chicharito, at the back with Jones injured. If they get another injury there they could look weak. And at goalkeeper where they had De Gea.
"It's a massive two weeks, it's a big, big two weeks for Manchester United in terms of trying to hold onto those players they've got and strengthen as much as they can."