Khan is going through the due-diligence process but is confident he can close the deal "relatively soon", possibly even within "two or three months".
Chelsea could be seeking a new home while renovations are being done to Stamford Bridge.
"We will absolutely be looking into things like that. We want to support English football and we want to support Wembley.
"Wembley will remain as the cradle of English football, only supplemented by the NFL and other events."