England trio sit out training
Brown was left back at the team hotel nursing a knee injury that kept him out of Manchester United's 4-0 win over Wigan.
Campbell and Smith were receiving treatment at England's St Albans training base, for Achilles and knee problems respectively.
England captain John Terry was wearing his protective mask.
Steve McClaren's men welcome Estonia to Wembley on Saturday before travelling to Moscow for a crucial Group E clash against Russia four days later.