Manchester United interim boss Ralf Rangnick is already frustrated with the board.

The German, who has overseen mixed results and performances since his appointment as the replacement for Ole Gunnar Solskjaer until the end of the season, wants the team to invest in the transfer market.

According to the Mirror, Rangnick is unhappy that his recommendations on winter signings are being ignored by others at the football club.

United are reluctant to spend too much money on Rangnick signings, as they are not sure who will be in charge of the team for next season.

German sources report that Rangnick feels he is doing the job with a hand tied behind his back at present.