Lazio coach Edy Reja is enjoying the battle for a top four finish.
With nine games of the season remaining, Lazio find themselves three points clear of Napoli and Udinese, who both drew at the weekend.
"The fight for the Champions League place will continue until the final moment, but winning after suffering extremely so against a team in good shape like Cagliari is a significant signal," said Reja.
"We defended as 11, everyone sacrificed for the good of the team. There was great concentration."