Malinga was smashed to all parts of the Hagley Oval on Saturday in his team's 98-run loss to New Zealand, ending with figures of none for 84 off his 10 overs as the Black Caps piled up 331 for six.
It was the 31-year-old's first international match since undergoing ankle surgery in September.
But Muralitharan, who retired in 2011 after taking 534 ODI and 800 Test wickets, believes Malinga will have benefitted from his brutal treatment.
"We have to be realistic about him, after all. He is coming into the tournament off the back of no cricket since his ankle surgery last September and it will take time for him to get back to his best.
"And the chance to get more overs under his belt against Afghanistan and Bangladesh (in their next two games) will be good news for him and for Sri Lanka."
Malinga, who has 271 ODI wickets and is seen as his team's go-to death bowler, starred at the 2007 World Cup in the Caribbean where Sri Lanka finished runners-up to Australia.
Sri Lanka batsman Lahiru Thirimanne, his team's top scorer with 65 against New Zealand, also backed Malinga to bounce back.
"I don't think this is Lasith's best bowling effort," said the opener. "We believe he'll come back strongly in the next few matches, but I think he bowled really well in the death overs.
"That's a positive for us, so hopefully he'll be back with good performances.
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