Memphis Depay's leaked contract showed that he earned £3.9m basic if not in CL, and £5.2m basic if we were in the CL that season. On top of that he got £20k per start and £10k per sub if before 70 mins. 20 starts worth another bonus of £200k and a similar amount if he reached 40 starts. Given that he wasn't signed as a mega star, and cost £26m, I think you can reasonably assume that most of the established squad players (Herrera, Jones, Bailly, Smalling, Lindelof, Martial, Valencia etc) will be on similar amounts, so between £5.5m and £6.5m. If United took up the one year option on his deal, his basic went up further so those players who we have used the option (Herrera, Mata, Shaw) will probably be earning more this year.
Based on all the available evidence, including the Football Leaks book, this is my best guess at the salaries for last season. Not sure about Darmian as LVG said he was signed as back-up to Valencia so might be on a lower figure. Romero is another difficult one to estimate.
De Gea 11, Romero 4, Joel Pereira 0.5
Valencia 6.4, Young 6.2, Shaw 5.6, Darmian 5.6, Blind 5.6
Bailly 5.6, Smalling 6.5, Jones 6, Rojo 5.6, Lindelof 6
Matic 10, Pogba 18, Herrera 6, Fellaini 5.6, McTominay 1, Carrick 5.3
Lingard 6, Mata 8, Rashford 5, Martial 6,
Lukaku 12, Zlatan 1.6, Sanchez 10 (from Jan, full year would be 22m+)
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Tuanzebe 0.5 for first half of season, Mkhitaryan 6 for first half of season