looked to have won in it for the Hammers in the first minute of stoppage time, only for VAR to award Fulham a penalty at the other end - but Lookman could not profit as his Panenka attempt was kept out.
Sebastien Haller and Aleksandar Mitrovic had fired blanks again as a tepid encounter was drifting towards a goalless draw.
But the match exploded into life in stoppage time when Czech midfielder Soucek finished clinically after he was set up by £25million new boy Said Benrahma.
Benrahma then had an impact at the other end when he was adjudged to have tripped Tom Cairney in the penalty area - referee Robert Jones consulting the pitchside monitor before pointing to the spot.
But with the last kick of the game, Lookman chipped his penalty into the arms of Lukasz Fabianski.
It was such an awful effort that Fabianski, who had begun to dive to his right, actually had time to get back up and make the save.
Additional reporting by PA.
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