Palace must invest again

It's the ultimate shop window: a World Cup with 48 teams - all packed with players eager to show what they can do on the biggest stage.With the transfer window now open, BBC Sport journalists have been taking a look at some of the key names being discussed.[Getty Images]Crystal Palace will come into the season fresh from winning the Conference League, and they have another European campaign as a result.The main thing that was highlighted last season was that the squad that Palace started the sea