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Manchester United will wear white socks for their FA Cup clash with Middlesbrough on Friday.

The Red Devils, who usually don black, have decided on the switch 'to avoid potential issues for colour-blind fans and viewers'.

This is because their opponents only have two choices of kit for the fourth-round tie at Old Trafford, red or all-green.

United, who wear red themselves, have therefore changed from black socks to white 'to help increase the visual contrast' to red or green, sources told the Mail.

Colour-blindness comes in many forms and people with deuteranomaly and protanomaly - collectively known as red-green colour-blind - generally have difficulty distinguishing between reds, greens, oranges and browns.

Ralf Rangnick's men last wore white socks for their dismal 1-1 draw at Newcastle after previously wearing them for a 2-2 draw in the Champions League away to Atalanta.

They were also used in Ole Gunnar Solskjaer 's final victory as boss, a 3-0 win at Tottenham.

The Red Devils will be desperate to repeat the same outcome as in the latter match when Middlesbrough come to town on Friday and club legend Bryan Robson believes the competition is "absolutely massive".

"This group of