Former number one draft pick Lachie Whitfield has been investigated for deliberately hiding from drug testers with the help of two former Greater Western Sydney football officials.

The AFL has completed an investigation into the matter and is considering what, if any, action to take against Whitfield and former football manager Graeme Allan and welfare manager Craig Lambert.

It is understood there are incriminating text messages between Whitfield and his then girlfriend which are at the centre of the investigation.