Fletcher out for season following sickening injury
The decision has been made following further hospital tests on Tuesday after the 28-year-old bowler suffered concussion during Saturday's T20 Blast game at Birmingham Bears.
Director of Cricket, Mick Newell, told the club's website: "Following consultation with doctors, Luke has been ruled out for the rest of the 2017 season to allow adequate time to recover and complete a monitored care plan to ensure he has a safe return to play.
"Whilst we are all obviously very disappointed, Luke's health is of paramount importance and comes first.
"We will continue to give him every support as he undergoes his recovery."
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