Two goals early in the second half from Dani Osvaldo and Rickie Lambert secured the three points for Saints, who moved in to the top four of the Barclays Premier League with the win.
"We are not setting ourselves any limits," he said.
"We just have to keep on believing and the players believe fully in how we want them to play. We are now going to have to work harder because teams know more about us and will respect us a little more now."
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