ADELAIDE veteran David Mackay will be part of the Crows' rebuilding process after signing a one-year deal to confirm he'll play his 13th season in 2020.

The 31-year-old wingman played 18 games this year, averaging 17.2 disposals, to take his total to 220 games with the Crows since being drafted with the 48th overall pick in 2006.

Mackay is on track to be on the oldest player on the Crows' list next year with Eddie Betts likely to request a trade to Carlton, free agent ruckman Sam Jacobs expected to move to Greater Western Sydney and Richard Douglas having been delisted.

Crows list manager Justin Reid told the club's website that Mackay's experience would be crucial as the Crows go through a transition period.

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"David had one of his best seasons and his attitude, preparation and training standards are always first class," Reid said.

"We see him making a valuable contribution both on and off the field next year."

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The Crows have also re-signed ruckman Kieran Strachan to a one-year rookie extension.

The announcement of Mackay and Strachan's re-signings comes while the Crows are without a senior coach and are undertaking an external review.

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Rookie-listed midfielder Cam Ellis-Yolmen and forward Riley Knight remain unsigned for next year.

Uncontracted defender Alex Keath has requested a trade to the Western Bulldogs, while midfielder Hugh Greenwood is being wooed by Gold Coast.

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