Tom Heaton
The English keeper actually started his career out with Manchester United and was farmed out on loan to various clubs in order to get game time. His career at Manchester United never took off, due to the presence of the legendary Edwin Van Der Saar. He eventually moved to Cardiff City followed by a move to Bristol City, from where he moved to Burnley, the club he currently represents.
He has done fantastically well with Burnley as he has become one of the premium shot-stoppers in the league. A return to Manchester United would certainly be welcomed by Heaton, who has some unfinished business with the club he once called home. The fact that United are likely to be involved in a European competition next time, means that Heaton would get decent enough game time at Old Trafford.
Ethan Horvath
Relatively an unknown goalkeeper, Horvath has done well since moving to European football, where he represents Norwegian club Molde FK. The United States national has been primed for success and could follow in the steps of Tim Howard, another American who moved to Manchester United. Horvath has been exceptional in Norway and that has seen him linked with numerous clubs, who are interested in snapping up the next big thing in American football. Horvath would certainly do well to prove competition to David De Gea.