In his first game since the recent Africa Cup of Nations in Gabon, the Ghanaian, a second-half substitute, scored to cancel out Troy Deeney's opener for Watford in the Premier League fixture, which ended 1-1 at Vicarage Road.
Having seen his form dip due to an injury which kept him out of action until October last year, there have been quite some joy over the mark of potential revival.
“I am very happy for Andre, as I am very happy for every player when they come back from injury," West Ham midfielder Pedro Obiang told his club's official website.
"From the start, he was injured but now, he is starting to play a little bit.
"We need to keep going with him because he can do good things.
West Ham skipper Mark Noble was among the earliest to sing Ayew's praise following Saturday's goal.
But Ayew's heroic did not catch the eye of only his teammates.
“We have to praise Ayew - from the bench," manager Slaven Bilic said.
"He got a big injury in his first game against Chelsea.
"He has come back from the Africa Cup and is looking back to his best."
Ayew joined West Ham on a club record transfer from Swansea City last summer.
He has two goals in 13 league appearances thus far.