Richmond captain Kane Johnson underwent scans this morning after injuring his left knee during yesterday’s match against Sydney.

The scans revealed Johnson has a slight strain in the medial ligament, which is likely to see him sidelined for 3-4 weeks.

Johnson injured his knee during the first quarter of the Tigers' loss to the Swans on Sunday.

Johnson has been in excellent form this season and is ranked in the top five Richmond players for disposals, handballs and tackles after 10 rounds.