Salah, who has not been at his best since returning from injury last month, was brought on in the 79th minute, just after the Hammers' second goal levelled the game
France international Pogba joined United for 89 million pounds ($115.05 million) in August.
Extracts from a book, "The Football Leaks: The Dirty Business of Football", published in Germany this week, included a breakdown of the fee and were reproduced in media reports on Tuesday. ($1 = 0.7736 pounds)