Matthews, who suffered from cramps during his unbeaten century knock in the second ODI at Mohali on December 13, bowled and batted as the Sri Lanka cricket team hit the ground running by taking part in a training session today.
Mathews had a couple of batting stints and also bowled some overs in between.
Team manager Asanka Gurusinha said Matthews is fit and will be available for the series decider.
The islanders had a training session that lasted a little over three hours. The batsmen and bowlers went through their usual drills under the watchful eyes of the coaching staff led by Nic Pothas.
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Meanwhile, the Indian team called off their optional training session scheduled for later in the day.
The series is locked at 1-all after India bounced back strongly, riding on skipper Rohit Sharma's splendid double century to post a big win at Mohali.