Match result: Manchester United 0, Atletico Madrid 2.
Martinez posted a message saying he was frustrated and wants more investment in the squad.
He called for better recruitment and said players must take responsibility.
The team has not won in five matches, putting pressure on the coach.
He said the team needs more money to bring in good players and criticized the club’s director of football.
He also reminded that the players themselves must improve and work together.
The club’s coach and leaders are being watched closely after five games without a win.
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