Sri Lanka rested him in the Super League match against India on Thursday after they had already qualified for the final.
Captain Mahela Jayawardene played down the hype around his unorthodox spinner, who has six different deliveries in his armoury.
"We are not going to put lot of pressure on the guy," said Jayawardene of Mendis, who has been in the limelight since making his debut against the West Indies earlier this year.
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"He (Mendis) has done what he is capable of doing, we are just going to give him the freedom to go out there and enjoy his first final playing for his country, that's how we are going to treat him," said Jayawardene.
Spinners Upul Chandana and Sanath Jayasuriya contributed to Sri Lanka's 25-run win over India in the 2004 Asia Cup