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
The Italian champions barely gave Barca a glimmer of hope of repeating their historic turnaround against Paris St Germain in the last 16 and protected their healthy advantage from the first leg by starving the hosts of space and clear sights of goal.