Fire stations across the borough are under threat of closure after it emerged the service must make £65m of savings next year.
A report in the London Evening Standard claimed last week there are plans to close 30 stations across London, resulting in the loss of 1,000 jobs.
There are concerns that stations in Battersea, Tooting and Wandsworth could face the chop, but the Mayor of London has yet to confirm any proposals.
Other cost-cutting measures might include taking fire engines off the road, which could mean other stations having to provide cover in Wandsworth.
Firecrews have said if any firefighters are made redundant they will take industrial action.
Patrick Gaughan, Fire Brigades Union representative for Tooting, said at the moment staff have been left in the dark.
He said: "We still don't know what is going to happen. We are going to know within the next couple of months.
"Stuff like working overtime and redundancy is going through our minds. There is no news yet where that axe is going to fall."
A fire brigade spokesman said: "Like virtually every other public service, the brigade is facing the need to make savings.
"The Mayor has given a target for these savings, and we are considering our response to this.
"All options are being considered but no decisions have yet been made."
The closures will be considered at the London Fire and Emergency Planning Authority board this autumn.
A spokesperson for the Greater London Authority said no proposals have been put before the mayor as yet.