The 25-year-old, whose penalty stopping save in a shoot-out against Tottenham over the weekend earned United their second piece of silverware this season, looks set to be offered a four-year deal worth £25,000-a-week according to the Mail.
Foster's current contract is up in 16 months and he has insisted that he sees himself playing for no other club.
Looking to fill the void that will be left after Van der Sar leaves at the end of next season, the one-time capped England international hopes to enjoy many more cup finals and successes with Sir Alex Ferguson and United.
'I want to stay here for as long as I can,' he said. 'It's the biggest club in the world. At 25 I am still young for a goalkeeper so hopefully, I'll have a decade or more here and I want this to be the first of many more trophies to come my way.
'Edwin has been fantastic this season. You have to look at his record of clean sheets. I wouldn't have thought one final will lead to a run of games for me. I'm always confident when I get the chance to play – which isn't too often at the moment so I just have to keep going."
Foster, focused on his pursuit for success also has his eye on securing a place in Fabio Capello's England squad for the 2010 World Cup.
After collecting his winners' medal from the Italian at Wembley Stadium, the Lemington Spa born goalkeeper admitted it was the first interaction he had had with Capello.
"I had never spoken to Fabio Capello until I went up to get the trophy," he said. "He shook my hand and said well done, which was nice, but I have to be realistic, I need to be playing.
'I can't expect to be in the England team if I'm not playing regularly. Fabio Capello has made it clear he isn't picking players on reputation, only on merit.'
His desire to see his career develop at Old Trafford and under Capello was strengthened by Ferguson, who said: "The present belongs to Edwin van der Sar, that's obvious. But, given that experience in a final, it strengthens my belief Ben will be England's goalkeeper for the next number of years."