I heard that Man United's failure to appear in the UCL will result in a fine from Adidas.  Man United will have to pay the equipment provider Adidas £10 million. This is because they will miss 2 years in Europe. United's agreement with the German manufacturer states that they cannot spend consecutive years outside the top European tournaments. This condition seems to be a new financial burden, this problem seems to have happened but only 1 year during the Sir Alex Ferguson era in 2014/15. 

Source: https://www.mirror.co.uk/sport/football/news/man-utd-adidas-deal-penalty-35269735