Fonte, 41, believes back-to-back home wins are with Southampton on just nine problems from 24 games, 10 problems adrift from security.
The former captain admits time is running out, but remains hopeful if he can those key accessories.
Speaking to Boylesports, he said: “I think it is now or never for Southampton. Valten Ipswich Town and if they can beat AFC Bournemouth and Brighton at home, they will have an opportunity.
“If they get 15 points, they can start to show that they have enough to stay standing.
“Now or never in those two games show that they can fight and I hope they can do that, if they don’t, things may be too difficult to achieve. “