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.
"I think it is complete happiness for every manager is what happened today, a clean sheet and your two strikers getting on the scoresheet," he said.
"In the second half we were much better than the first half and over the 90 minutes we were the better team.
"We struggled a bit in the first half to understand the set-up of the game but after the break we corrected certain things and that allowed us to play much better in the second half."
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