The Football Association are coming under increasing pressure to review their decision not to punish Chris Morgan for the challenge which left Barnsley's Iain Hume with a fractured skull.
Two more MPs have joined a growing parliamentary group calling for the FA to further punish Sheffield United defender Morgan, who was booked for elbowing Barnsley striker Hume in the side of the head at Oakwell last month.
Jim Devine, Labour MP for Livingston, and Michael Clapham, Labour MP for Barnsley West and Penistone, are the latest to declare their support.
Barnsley Central MP Eric Illsley tabled an early day motion in parliament last Friday and Mike Hancock, Liberal Democrat MP for Portsmouth South, Nick Palmer, Labour MP for Broxtowe and Ann Cryer, Labour MP for Keighley have already signed it.
Canada international Hume suffered a fractured skull and internal bleeding in the incident which overshadowed the South Yorkshire derby on November 8.
The 25-year-old spent 24 hours in a hospital high dependency unit after undergoing emergency surgery the following day when his condition had deteriorated.
The FA later decided not to punish Morgan further, concluding they could "only bring additional charges in the most exceptional cases and only if it can be proved beyond doubt that the actions of a player were a deliberate attempt to injure an opponent".
But Illsley and his fellow MPs disagree with the FA statement, while Barnsley and Hume are currently considering "what legal avenues are open to them".
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