First-year Kangaroos defender Declan Watson has suffered a suspected serious knee injury at training on Thursday.

Watson, 18, crumbled to the Arden St surface clutching his left knee and was quickly surrounded by North Melbourne trainers.

He was able to walk from the ground with a trainer on each side of him, but was visibly distressed.

North Melbourne's medical staff immediately sent Watson for scans to determine the type of injury and severity.

The 194cm Aspley product returned in the VFL for Werribee at the weekend after a long absence with ankle and shin problems.

He was slated to play in the Development League, but a player shortage saw him play in the seniors and he was a strong performer.

Watson was the Kangaroos' second pick in last year's NAB AFL Draft at No.34 overall.

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