The youngster pulled off a string of saves to help Boothroyd's men reach the last four of the FA Cup with a 1-0 win over Plymouth.
"Ben Foster underlined why I think he will be the world's number-one goalkeeper," said Boothroyd.
"He's got a terrific work-ethic but, more importantly, he has humility - he takes time to talk to people and sign kids' autographs."
Foster will not be allowed to play against United if they are drawn against Watford in the semi-finals later today, and could also face FA Cup final heartbreak if both sides meet at Wembley.
But Boothroyd believes he will challenge current United No 1 Edwin van der Sar when he returns to Old Trafford next season.
"That's why Sir Alex Ferguson wants him back, that's why he's got his cap and why he will go on and prove his worth," Boothroyd added.
"If Ben Foster is called upon by England, he'll be absolutely outstanding. It's up to Steve McClaren to pick him."
Can Foster become the next regular England goalkeeper?
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Showing comments 1 to 25 and replies | View All
Balders, Halifax (12/03/2007 at 10:18)
Robbo, North Stand (12/03/2007 at 10:46)
stu, london (12/03/2007 at 10:52)
chris, oxford (12/03/2007 at 11:10)
edinburgh red, edinburgh (12/03/2007 at 11:14)
Jonathan Chin, Truly Asia (12/03/2007 at 14:22)
Demo, Glossop (12/03/2007 at 14:29)
Utd-For-Life, marseille ex-stretford (12/03/2007 at 14:34)
bobbydazzler (12/03/2007 at 14:56)
Mick, Dublin (12/03/2007 at 15:22)
Lee , Heywood, Heywood (12/03/2007 at 16:07)
Macca, Cornwall (12/03/2007 at 16:13)
george (12/03/2007 at 16:16)
His concentration looked good and he's improved since last seasons play offs.Kuszcak hasn't had as many starts and that hasn't helped his cause but we seem to have 3 good keepers at least.Paul Robinsons place is under threat and if Foster takes it he will grow in stature.
de Meester, netherlands (12/03/2007 at 16:28)
We should at least be ok in the keepers departmaent for a few seasons!
Balders, Halifax (12/03/2007 at 17:14)
Utd-For-Life, marseille ex-stretford (13/03/2007 at 08:31)
Birdy, Ireland (13/03/2007 at 08:50)
Mick, Dublin (13/03/2007 at 09:58)
Frank Old Trafford (13/03/2007 at 10:16)
chris, oxford (13/03/2007 at 10:27)
Alias Smith, over the moon (13/03/2007 at 10:43)
chris, oxford (13/03/2007 at 11:41)
stu, london (13/03/2007 at 11:48)
bobbydazzler (13/03/2007 at 11:52)
chris, oxford (13/03/2007 at 12:09)