In a move straight from left-field, Calum Chambers has moved to Fulham on a season-long loan move - despite being handed a long term contract by the club only weeks ago.The England defender has impressed of late, filling in during the tail-end of last season and also for Unai Emery’s pre-season, and it was his displays in these matches and during training that compelled the club to tie Chambers up for the foreseeable future.It was expected that with Laurent Koscielny out long term, that Chambers would take up one of the first team centre-half spots in the side, but Chamber has been allowed to go to Craven Cottage as Fulham continue to strengthen their side extensively.The Cottagers will be getting a damn good player too. Two seasons ago, Chambers starred in Middlesbrough’s last season in the Premier League before relegation, and last season saw him rise up into contention with his performances.Arsenal are being linked with Croatia defender Domagoj Vida, and with Rob Holding and Konstandinos Mavropanos as back up central defenders, will Unai Emery move to sign Vida and perhaps add some more strength to the defensive unit?If this was the case, why loan Chambers? He is more than ready for the first team, and Emery and the backroom staff obviously rate him, otherwise a long term deal would not be offered. It is a perplexing move, but it sees Fulham profit. They will need defensive solidarity, and with Jean-Michel Seri sitting in defensive midfield to act as a very effective shield in front of the back four, Chambers could be sending us a season-long reminder of what could have been.The move is at least a loan, so Chambers will be coming back into the fold next season, and with Koscielny another year older, and Sokratis getting no younger, Chambers could be returning back as the finished article - and straight into the first eleven.Good luck Calum, Gooners will be keeping a close eye on Craven Cottage this season!