Nasri will join a large French contingent at Arsenal which already include captain William Gallas, Gael Clichy, Abou Diaby and Bacary Sagna.
Djourou hurt his right shoulder in a collision with team-mate Bacary Sagna during Saturday's 2-0 FA Cup defeat by Manchester United.
Djourou, 24, hurt his right shoulder in a collision with team-mate Bacary Sagna during the FA Cup tie against Manchester United on 12 March.
Losing the excellent Bacary Sagna to injury was a blow, but did Wenger make the right decision in moving Kolo Toure from centre-back to right-back?
With McCarthy's men still reeling, Arsenal carved out a superb third, when Bacary Sagna's cross was brilliantly laid off by Van Persie for Fabregas to slot home.
After Gavin McCann's heavy tackle on Bacary Sagna, for which he was cautioned, tempers flared between Cesc Fabregas and El-Hadji Diouf and they had their names taken too.
He was also angered by Balotelli, who was lucky to stay on the pitch after a first-half tackle on Alex Song before being booked after tangling with Bacary Sagna.
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Chamakh's header from Bacary Sagna's cross was only inches away with Cech beaten, before Koscielny somehow headed the resulting corner over the top, despite standing almost on the goalline.
It was Arsenal who turned up the pressure - Howard scrambled to clear Aaron Ramsey's cross and then the keeper palmed away Bacary Sagna's corner as Arshavin shaped to shoot.
Kolo Toure, playing at right-back because Bacary Sagna is out injured, looked a shadow of his normal self - and even Cesc Fabregas looked shockingly out of sorts in midfield.
However, with centre-back William Gallas also doubtful having hobbled off against Liege with an ankle injury, Wenger could start Mikael Silvestre, or even move either centre-back Thomas Vermaelen or right-back Bacary Sagna to the left.
First van Persie saw his point blank header kept out by Wojciech Szczesny then a mistake by Bacary Sagna let the Dutch star free and the defender responded by pulling him down in the penalty area.
Shortly after an unmarked Johan Djourou nodded over from Bacary Sagna's cross, Nasri and Arshavin played a one-two on the right-hand side of the area and the Frenchman escaped the attentions of Gareth Barry to fire past Hart at the near post.
Wenger made four alterations to his starting line-up - Eboue, Kieran Gibbs, Diaby and Eduardo replacing Bacary Sagna, Gael Clichy, Alexandre Song and Nicklas Bendtner - but the change of personnel did little to disrupt a rhythm that had brought Arsenal impressive wins against Everton and Celtic.
BBC: SPORT | Football | Premier League | Arsenal 4-1 Portsmouth
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