Chelsea have just nine matches to play and Mourinho is delighted to see Ba finding the net at a crucial time.
He said: "Demba is very important. I proved during the season that I was right with the decision to have three strikers because when one is injured you need the other two. I think it's one of the best decisions we made, to keep three strikers.
"It was good for him and good for us that he got those goals. The game was dead, so they're not the goals he wants to score but it gives him confidence.
"He played 90 minutes in the national team [Senegal last week], came here scored twice so that was good."
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