Former Arsenal defender Martin Keown says the system Louis van Gaal plays need changing because "it doesn't work".
Former Germany striker Miroslav Klose says working for Louis van Gaal at Bayern Munich was "a tough time" in his career.
Boss Louis van Gaal insists he was "not shocked" by Manchester United's 4-0 defeat at MK Dons in the League Cup.
From £100 man Willie Groves to £59.7m signing Angel Di Maria, see how British football's record transfer fee has soared.
Fixtures, Results & Competitions
Manchester United suffer a humiliating League Cup exit to MK Dons after a comprehensive defeat at the League One side.
Manchester United sign Argentina winger Angel Di Maria from Real Madrid for a British record transfer fee of £59.7m.
Manchester United agree to pay a British record transfer fee of £59.7m to sign winger Angel Di Maria from Real Madrid.
Manager Louis van Gaal says a single point from two games is not acceptable after Manchester United draw 1-1 with Sunderland.
Manchester United are still looking for their first league victory under Louis van Gaal after a 1-1 draw at Sunderland.
Manchester United boss Louis van Gaal says it will take "a miracle" for his side to win the Premier League this season.
Manchester United manager Louis Van Gaal says the injury situation is getting better but he is "a little thin in midfield".
Louis van Gaal calls on Manchester United fans to "believe" in him after the disappointment of his debut league defeat.
Angel Di Maria has rejected the offer of a new Real Madrid contract and wants to leave the European champions.
Eleven-time Premier League winner Paul Scholes says he is "genuinely scared" for his former club Manchester United's future.
Manchester United announce the £16m signing of defender Marcos Rojo from Sporting Lisbon on a five-year deal.
Manchester United will pay Nani's wages - around £4.8 million - for the duration of his year-long loan to Sporting Lisbon.
Manchester United captain Wayne Rooney says his side will learn from Saturday's result under manager Louis van Gaal.
David Moyes believes he was not given enough time before being sacked as manager of Manchester United.
Gylfi Sigurdsson praises the tactics used by Swansea City in their memorable opening day win over Manchester United at Old Trafford.
New boss Louis van Gaal says Manchester United's confidence will be "smashed" after a 2-1 opening-day defeat by Swansea.
Video & Audio
Features & Analysis
"So poor it beggared belief" and a Man City player's jubilation - reaction to Man Utd's heavy defeat by MK Dons.
After Manchester United sign Angel Di Maria for £59.7m, Tim Vickery says the Argentine will thrive on being the main attraction.
Defeat by Swansea is a harsh reminder for new Manchester United boss Louis van Gaal of the challenge he faces.
BBC pundits, commentators and journalists predict who will win the Premier League title and who will finish in the top four.
As Liverpool prepare for life without Luis Suarez, BBC Sport looks at how other sides have coped with losing their prize asset.
If new Man Utd boss Louis van Gaal suffers from insecurity, he does a pretty good job of disguising it, writes Simon Stone.
Louis van Gaal delivers an assured performance as he is formally introduced as the new manager of Manchester United.
Netherlands coach Louis van Gaal once nearly took over at Manchester United - but is he the right man for the job now?