England can dominate the Six Nations for years to come, says former France fly-half Thomas Castaignede.
Coached by Australian Eddie Jones, England won a first championship since 2011 and can wrap up the Grand Slam with victory over France on Saturday.
Castaignede, who won Grand Slams in 1997 and 1998, told BBC Sport: "There are no other teams near England.
"If they keep the same group of players together, they can win the tournament for many years."
England secured the title courtesy of Scotland's win over France on Sunday, which meant they cannot be caught even if they lose in France.
Their success is in contrast to their World Cup display last year, when they became the first tournament hosts to be knocked out in the pool stage.
Jones replaced head coach Stuart Lancaster in November.
Having won all four of his games in charge so far, the former Japan coach can secure a first English Grand Slam since 2003 with victory in Paris.
Former England centre Jeremy Guscott said Jones "promised us changes and he's delivered", while ex-Wales fly-half Jonathan Davies added Jones has done "all the right things".
"England have quality, are very well organised and Eddie Jones brings confidence," added Castaignede.
"They deserve better than the title, they deserve the Grand Slam. I've been really impressed with England and the way they're playing."
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Has Jones delivered?
England secured the Triple Crown by beating Wales 25-21 at Twickenham on Saturday, nearly six months after Warren Gatland's side had pulled off a remarkable comeback to beat England in the World Cup.
Jones has made a series of changes, including taking the captaincy from Chris Robshaw and handing it to the recalled Dylan Hartley.
He picked James Haskell on the open-side flank, moving Robshaw across to blind-side.
The former Australia coach also gave Test debuts to forwards Maro Itoje, Paul Hill and Jack Clifford and centre Elliot Daly.
"Eddie Jones promised us changes and he's delivered," said former England centre Jeremy Guscott.
"I've enjoyed the heads-up rugby. Eddie Jones has instilled this belief to play what's in front of you. They're playing with tempo.
"The accuracy is causing teams problems. They are deserved champions."
"There's a confidence that oozes from this England side," added Davies. "They have balance and a great strength in depth."
|Elsewhere in the Six Nations|
|England claim Six Nations after Scotland beat France|
|Scotland 29-18 France|
|Grand Slam is on for England - Jones|
|Robshaw 'pivotal for England'|
Time for a couple of beers?
Jones watched from his squad's training base at Pennyhill Park on Sunday as Scotland's win over France secured the title for England.
"I feel a bit mixed," said Jones. "It's nice to win the championship, but, as a team, we feel like we haven't achieved anything yet.
"I've just seen Dylan Hartley. We didn't know whether to shake hands, hug or just get on with business. We decided to shake hands and get on with it.
"We'll have a normal team meeting and then we might go down the bar and have a couple of beers."
|Saturday's final Six Nations fixtures|
|Wales v Italy - 14:30 GMT - BBC One and BBC Radio|
|Ireland v Scotland - 17:00 GMT - ITV and BBC Radio|
|France v England - 20:00 GMT - BBC One and Radio 5 live|