It is not the first time the singer has stepped into to help the club, with a £20,000 cash boost sent to help the club owners make repairs to the roof in 2007.
Morrisey’s latest donation puts the club about £40,000 shy of its target of raising £250,000 by November to avoid imminent closure.
Organisers said the funds were needed after maintenance and staffing costs had begun to outstrip budgets, and to replenish reserves that had run dry.
The club runs youth programmes and football teams for boys and girls in the area, having originally been opened as a boys-only club by the founder of the Scout Movement, Robert Baden-Powell.
About £160,000 had been raised before Morrissey’s donation, with £100,000 given by Salford City Council.
Ms Slingsby said the support had been “so exciting”, and had “really cemented” the feeling there were people who “wanted to support the youth and the building”.