The 27-year-old returned to first-team action after suffering with illness against the Toffees in an FA Cup third-round replay at the Boleyn Ground last week.
Song, who joined West Ham from Barcelona on a season-long loan deal in the summer transfer window, could feature for only 60 minutes against Everton.
Former Cameroon international Song played the entire match against the Tigers and emerged with decent stats of 79% pass accuracy, one chance created, two attempted take-ons, 50% aerial duels won and two clearances made.
Song was happy with his performance against Hull and admitted his problems against Everton.
"I'm feeling much better," the former Arsenal star told West Ham’s official website. "When I came back from Cameroon I was a little sick for five days.
"It was hard to play against Everton, as I couldn't really breathe properly, but it was good for me to play then because I need to play to get my fitness back.
"Then today it was much better. Hopefully I can have a full recovery this week and be ready for the next game because we have a lot of important games coming up.”
Song was understandably not at his best against Everton, but the Cameroonian remains a key player for West Ham.
The Barcelona-owned star has been one of the best defensive midfielders in the Premier League so far this season and a main factor behind the Hammers’ rise up to seventh in the table.
For West Ham to finish in the top four, Song will be hugely important. The sooner he gets back to full fitness and to his best, the better for the London outfit.