Wasps say it is too early to say how long Dan Robson could be out of action as the scrum-half has been sidelined by blood clots.
Wasps have revealed that England scrum-half is facing a spell on the sidelines as he has been diagnosed with blood clots.
Robson scored his first Test try after coming off the bench to win his second cap in England's Six Nations thrashing of Italy last weekend.
The 27-year-old was replaced by Ben Spencer in the squad for England's final match of the tournament against Scotland on Saturday.
Wasps on Saturday stated why Robson will not be involved in the Calcutta Cup clash at Twickenham.
The Premiership club said in a statement: "Wasps can confirm that Dan Robson suffered blood clots which arose spontaneously earlier this week and is being evaluated and treated by specialists at the moment.
"At this stage it is too early to give a return-to-play date."
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