Southampton and West Ham missed the opportunity to leap into the European places with the teams playing out a 0-0 draw at St Mary's.
Danny Ings found the back of the net in the sixth minute but the goal was ruled out by VAR with Che Adams offside in the build-up.
The Hammers rode their luck for most of the first half but Manuel Lanzini blasted a good chance over the bar just before the break.
Said Benrahma had the best chance to find a winner in the 85th minute but Alex McCarthy produced a fine sprawling save to deny the forward.