Cesc's vision and passing ability will be missed, and so will Nasri's dribbling and drive.
And although Aaron Ramsey is meant to be the "heir" to Cesc's throne, he's not quite there yet, and we don't have time to wait about for him to fulfill his potential.
Jack Wilshere is also another who can take Cesc's place, but like Ramsey, he isn't good enough YET, Also, Jack Wilshere isn't much of a goal threat, scoring only two goals last season and missing a lot of chances.
As we've seen in the Newcastle and Udinese game, we don't have a midfielder who will attack defenders. Yes, Gervinho does do it a bit, but we need someone who can float around midfield and the forward line and hassle defenders. There aren't many people who can do this better than Gervinho's former Lille team-mate Eden Hazard.
Eden Hazard is a long term target for Arsenal, and just in January Arsene Wenger said that he is tracking Eden, and would make a bid if he became available.
Lille haven't said he's available, but who cares, Wenger should still move for him.
Eden Hazard is a young and talented 20-year-old Belgian, and he isn't the "experienced" player that Arsenal fans want, but he is a player who we need to snap up sooner rather than later. In this time of crisis, now is the perfect time.
He won the 2008-09 and 2009-10 Ligue 1 Young Player of the Year, and also the 2010-11 Ligue 1 Player of the Year. Who cares if he isn't experienced? He's the "super quality" player that Arsene is looking for and is a perfect replacement for Samir Nasri.
His style of play is similar to Nasri's as he likes to attack defenders, and possesses enormous amounts of dribbling ability, maybe even more than Nasri. One thing I personally think Eden has that Samir doesn't is his eye for a pass. I believe he has more vision and a better passing range than Nasri.
And unlike Samir Nasri, Hazard's eye for goal usually does last more than half a season. He scored 12 goals along the course of last season, and also contributed 10 assists.
He was instrumental in Lille winning the league and cup double, and without him there I highly doubt they would have won.
Hazard is a truly magnificent player, and apparently a price of £26 million has been slapped on his head. Wenger said today he'd spend up to £40 million on a player if the player was "the right player," Arsene, Eden Hazard is "the right player," He is someone we need, and it will show everyone at the club and every Arsenal fan that there is ambition.
But Wenger shouldn't stop there, he still needs someone to come into central midfield and be a successful playmaker, just for long enough until both Ramsey and Wilshire mature a little, and form a potential Xavi and Iniesta partnership.
Also, two centre-backs, in my opinion, are needed: Gary Cahill from Bolton and Christopher Samba from Blackburn. A move for both is highly doubtful, but it is what I would love to see. If I had to choose one centre-back, it would be Cahill.
Let's hope with this Samesc Nasrigas money, Wenger will actually replace them, and lead Arsenal to silverware. If not silverware, at least batter Manchester City a few times and make the Champions League.