Matawalu is a free agent after leaving Exeter Chiefs and had a light individual training session.
The 28-year-old, who has 32 Fiji caps, left Glasgow in 2015, after helping the club secure its first PRO12 title.
He was released by Exeter this summer after failing to make an appearance.
He made over 70 appearances for Warriors, scoring 26 tries, and was voted player of the season in his final year.
Matawalu left Glasgow for a lucrative contract with English heavyweights Bath, but struggled for fitness after his move, making only 10 league appearances before joining the Chiefs in November last year.
The playmaker, who can also be deployed on the wing, started three of his country's four 2015 Rugby World Cup fixtures, and was in the Fiji squad for their trio of June internationals, although he did not feature in the win over Scotland.