Villa have also added Stewart Downing, Fabian Delph, Habib Beye and Andy Marshall to their squad this summer.
Beye turned and, in challenging to clear from the Brazilian, touched the ball before making contact with Robinho.
Beye set up Mark Viduka, who completed a confident win for Kevin Keegan's men with a sure-footed second-half strike.
Omar Daf, Habib Beye and captain Aliou Cisse are also out, and coach Guy Stephan has had to improvise in defense.
Home fans were livid after Styles sent off Habib Beye in the 13th minute when Beye appeared to clear from Robinho.
Meanwhile, in other transfer news, English Premier League side Aston Villa have signed defender Habib Beye from relegated Newcastle on a three-year contract.
Newcastle were looking irresistible and it all seemed incredibly easy as Beye picked out Viduka, who rifled the ball into the left-hand corner.
Etherington's is the sixth player Styles has sent off season, with Habib Beye's red card against Manchester City in October having also been rescinded.
Former Wigan striker Henri Camara is currently on trial with the Tigers while a bid for defender Habib Beye has been accepted by Newcastle.
Just before the half hour mark, defender Habib Beye wasted a glorious opportunity to double Senegal's lead as he lashed wide from nine yards out.
But Oster's attempted lob drifted wide of the mark while Doyle, looking for his first goal in 16 games, and Hunt were denied by a hustling Beye.
John Oster had a chance to level as Reading looked to respond but saw his header tipped away before Michael Owen hooked Habib Beye's cross into the net.
Collecting Beye's pass on the right of the box, he curled the ball past Hahnemann and into the back of the net for his fourth goal in as many games.
But referee Styles pointed to the spot and sent Beye off, leaving Newcastle's players and crowd seething with rage before Robinho wrong-footed Shay Given to convert the penalty with aplomb.
Michael Owen was out of contract at the end of last season and joined Manchester United, while Sebastien Bassong, Obefami Martins, Damien Duff and Habib Beye have all departed recently.
Mr Diallo has been sent to fill the vacuum left by the death of the previous mediator, Alioune Blondin Beye, and to steer the peace process back on to solid ground.
Making matters worse, the United Nations mission, which has the thankless task of trying to keep peace alive, is totally disoriented after the death on June 26th of its chief, Alioune Blondin Beye.
The visitors threatened when Shola Ameobi laid the ball off to Alan Shearer but after he had chested the ball down, Habib Beye blocked the former England captain as he tried to shape up to shoot.
BBC: SPORT | Football | Other European | Newcastle's Euro dream over
In the first-half the home team needlessly gave away possession far too often against a team of Arsenal's quality, while right-back Habib Beye repeatedly drifted too far inside and offered too much space to Tomas Rosicky.
Mr Beye, a Malian who had devoted five years to bringing peace to Angola, had concluded a few weeks before his death that there was nothing more he could do for a country whose leaders were not interested in peace.
Shearer expressed concern that Newcastle would struggle on the pitch in the Championship unless the team's off-field problems were swiftly rectified, allowing a new manager to strengthen a squad whose departures have included Michael Owen, Obafemi Martins, Mark Viduka, Habib Beye and Sebastien Bassong.
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