Ten Hag has now warned the Red Devils they must also invest to keep pace with their rivals.
United head to Premier League leaders Arsenal today, looking to cut an eight-point gap between the two teams.
Ten Hag’s men had a chance to reduce the deficit top six points on Wednesday, but conceded a late equaliser in their 1-1 draw at Crystal Palace.
“The Premier League in this moment develops into having six or seven teams who all can finally win the league because there are so many investments.
“When you have the right philosophy and strategy, many more clubs can compete for the top positions in the league,” Ten Hag said.