Manchester United boss Jose Mourinho has been assured he can spend big in January despite their stock market slide.

The Daily Star says the club's share price suffered an alarming drop in trading this week, falling from an opening price of $19.92 a share to $18.19.

But Mourinho has been told he will still be able to make some signings in January.

It means Mourinho will press ahead with plans to land Diego Godin, Lorenzo Pellegrini and Chelsea outcast Gary Cahill.

United's share price has dropped 14.5 per cent during the past month's trading.

By comparison, the value of Netflix has fallen 19.7 percent during the same period.