Bradford Bulls centre Adrian Purtell was kept in hospital overnight on Sunday after being taken ill on the coach after the defeat by Leeds.
The 27-year-old began to feel unwell on the journey back from the derby clash and the club doctor fitted a drip.
Football manager Stuart Duffy said: "Adrian's condition was giving cause for concern and the club doctor advised he should be taken to hospital.
"Our thoughts are with the player at this time."
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