The midfielder is fighting his way back to fitness and Sullivan is hoping he can replicate last season's performances.
The former Barcelona man signed on a permanent deal in the summer after a successful loan spell last season, but is yet to feature under Slaven Bilic.
That is because he picked up an ankle injury before the beginning of the campaign, and has been missing ever since.
He has stepped up his injury return though, having gotten through 60 minutes of a behind closed doors friendly during the international break.
He is reportedly targeting the clash with Tottenham as his full return, and Sullivan is hopeful they will see the player they had on loan again last season.
“We had good news with Alex Song playing his first competitive game against Crystal Palace last week in a behind-closed-doors friendly,” he told whufc.com.
“We need Alex back as soon as possible and if he can re-produce the form that he showed in the first half of last season, then we have a major player to come back into the first-team.”
Given how well Slaven Bilic’s side have started the season; there is an argument that Song should not immediately return to the side when fit.
While there is no denying he is a quality player, the West Ham midfield has performed well in his absence and Bilic may not wish to unsettle that balance.
Given his lack of match fitness as well, it may be better to slowly integrate him into the side to allow him to get to the pace of the side and the side to get used to him again.