http://news.bbc.co.uk/sport1/hi/football/eng_prem/6652931.stm
Middlesbrough and two unnamed clubs have joined in to support the legal action.
It is being reported as the legal action being against West Ham rather than the Premier League, also it sounds like the case is whether or not they were entitled to play Tevez after the PL guilty verdict.
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http://football.guardian.co.uk/News_Story/0,,2079270,00.html
although it doesn't clarify whether the action will be against WHU or the PL.