Arsenal hero Sol Campbell fears for his old club as they prepare to farewell Alexis Sanchez.

With Mesut Ozil and Jack Wilshere also inside the final six months of their deals, Campbell is concerned the standard of Arsenal's squad is plummeting.

He told talkSPORT: “Other teams have invested big money year after year and have also retained their best players and have kicked on.

“But at the moment, Arsenal are not retaining their best players. This is a vital period in Arsenal's season when they need to keep their best players and add to them, not take them away.

“When you start taking the really top players who can really turn a game away, you've got to fill that spot and it's not easy to do that in January.

“They've got to find players who can stabilise the team and move them forward into the summer, so they can build from there and more players come along.

“But if you keep on selling your best players, some players might say: 'Well, why do I want to go there? All their best players are leaving!'

“I think teams go in cycles - Arsenal are in this cycle and they need to figure out how to get out of it, but it might take three or four years."