Richmond will wait until later this week to decide on the fitness of four key players, ahead of Friday night's Round 4 clash with Collingwood.

Midfielder Brett Deledio, ruckman Shaun Hampson, defender Nick Vlastuin and small forward Jake King will all need to prove their fitness in training through the week.

Deledio missed last Saturday's loss to the Western Bulldogs - after playing 140 in-a-row - with an ankle injury.

Hampson was ruled out of the Bulldogs' game with a knee complaint.

Vlastuin was subbed out of the Round 3 match with concussion, and will face further tests this week, while King suffered a corked quad.

The Tigers will be without key defender Alex Rance for the game against the Pies, while he recovers from a foot injury.

Midfielder Daniel Jackson made a successful return from injury last weekend, picking up 23 disposals and laying nine tackles.