ARSENAL TRANSFER RUMOURS: Nasri, Costa, Cahill, and Chamberlain

Arsenal fans are growing increasing restless in a summer transfer period of little activity.

Arsene Wenger recently made the claim that he understands the frustration of fans, and that he expects moves to be made this week.

The Gunners' boss might be holding true to his word if a Daily Mirror report is accurate. The publication reports that young Southampton star Alex Oxlade-Chamberlain is expected to be moved to Emirates this week for a fee of £12 million.

Chamberlain has long been coveted by Arsenal, and it seemed that this move could have been made several weeks ago, since no other club seemed to be making a serious effort to land the forward.

At age 17, adding Chamberlain may do little to address next season's attack, as it seems more of a move for the future than of the present. The up-and-coming striker may not receive significant playing time with Robin van Persie, Gervinho, Marouane Chamakh, and possibly Nicklas Bendtner ahead of him.

Chamberlain isn't the only burgeoning star that is on Wenger's radar. Footybunker reports that Arsenal are now in the mix to add £10 million-rated Shakhtar Donetsk attacking midfielder Douglas Costa.

The chances seem slim for Arsenal to bring in the 20-year-old Costa considering the number of high-profile clubs that have shown more interest in the past few months. Sir Alex Ferguson is seeking a replacement for Paul Scholes, and has coveted Costa for more than a year.

Aside from Manchester United, clubs such as Chelsea, Tottenham, and Manchester City have all made an effort to sign Costa, one of the best young players in Brazil.

Back in mid June, Arsenal had an offer that involved midfielder Denilson moving to Shakhtar. Costa's agent said that Shakhtar rejected the offer only wanted money. Denilson has since been loaned by Arsenal to Sao Paulo.

Arsenal may have no other choice than to pursue Costa if reports are accurate of Samir Nasri moving on. There has been no word of progress in contract talks with the French midfielder. The Daily Mirror reported that Manchester City were turned down by Danish teenager Christian Eriksen of Ajax, in a £20 million deal, but are confident they can add Nasri.

Should Nasri indeed leave Emirates, Wenger would probably make a more serious effort to land Valencia's Juan Mata or Lille's Eden Hazard, not Costa.

The club remains in contention to sign defenders Chris Samba and Gary Cahill, according to Daily Mirror.

Of all the pressing needs, centre back remains the most important. Wenger has been clear that he would address the position this summer, and all indications point to him keeping his word.

Still, if Cesc Fabregas and Nasri are on their way out, Wenger will need top quality replacements if Arsenal expects to challenge the likes of Chelsea and Manchester City, let alone Manchester United.

Chamberlain, and possibly Costa, won't make up for the loss of two midfielders that might be among the five best in the Premier League.

There will be louder rumblings from Arsenal fans if this club isn't upgraded, and upgraded soon.