PORT Adelaide has revealed veteran midfielder Tom Rockliff is in hospital with deep vein thrombosis.

The 31-year-old, who is currently recovering from an MCL sprain in one knee and a procedure on the other after tearing the medial meniscus, was immediately sent for an ultrasound after presenting at the club on Monday and reporting the acute onset of calf pain.

The ultrasound confirmed the deep vein thrombosis and his condition will be monitored in hospital in the short term.

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It is horrible luck for Rockliff who has been out of favour this season but put himself back into contention for a senior recall after starring for the Port Adelaide Magpies in a game against Woodville-West Torrens on May 2.

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In that game, Rockliff picked up 34 disposals before landing awkwardly and injuring both his knees.

Scans later revealed the veteran ball-winner had injured both of his knees in the same incident.

The first scan showed a medial ligament sprain and that would sideline him for at least six weeks. Rockliff's right knee becoming painful and swollen in the following days.