Lee Westwood has signed a non-disclosure agreement regarding his possible participation in the proposed Super Golf League.

And two-time major winner Dustin Johnson said he is “not allowed to disclose” whether or not he has received a multi-million pound offer to contest the Saudi-backed breakaway circuit.

Speaking during last year’s US PGA Championship, the 48-year-old Westwood said it would be a “no-brainer” for him to sign a multi-million pound contract at this stage of his career.

However, players joining the SGL have been warned they face a lifetime ban from the PGA Tour and DP World Tour, a sanction which would rule them out of playing in the Ryder Cup or being captain.

Westwood was the odds-on favourite to captain Europe’s attempt to regain the trophy in 2023 until ruling himself out in November, saying he wanted to focus on his playing career.

Asked about the SGL on Wednesday during a press conference ahead of the Saudi International, Westwood said: “I don’t know whether I want to answer questions on that. I’ve signed an NDA.”

Johnson also mentioned disclosure agreements when asked about reports that Ian Poulter had been offered up to £22million to join the SGL.

“Obviously whether they have or haven’t, I’m not allowed to disclose. You’d have to ask Ian on that one,” Johnson said.

The former world number acknowledged that he had been offered a deal, but said with a smile that it was not “similar” to Poulter’s.

Phil Mickelson said he believes “pretty much every player” in the world’s top 100 has been contacted about the SGL and that the prospect of a rival circuit has given the players “leverage” with the PGA Tour.

“I think everybody is looking at it and seeing parts of it that can really help and benefit their situation, their life, their career, and then there’s parts of it that they’re probably concerned with,” the six-time major winner said.

“I’m appreciative of the fact that there is competition, and that leverage has allowed for a much better environment on the PGA Tour, meaning we would not have an incentive programme like the PIP (Player Impact Programme) for the top players without this type of competition.

“We would not have the increase in the FedEx Cup money. We would not have the increase in The Players Championship to $20million this year if it wasn’t for this threat.

“I’m appreciative of the competition, and what my hopes are is that the biggest thing, which are media rights and the way the players have been used for so long, I hope that that changes through the competitive opportunity, as well.”

While Westwood could not go into any specifics about the SGL, he did speak approvingly about the concept, in particular the team aspect which would see the 48 players competing in 12 four-player teams, as well as individually.

“When I’m at home I watch a lot of sport but not a lot of that sport is golf because it seems to me it’s just 72-hole stroke play week in and week out, and when I’m playing it, I’ve had enough of it by then,” Westwood said.

“The weeks and days that I would watch I would turn on for the Ryder Cup if I wasn’t in it. I would turn on for the Match Play. I think the first day at the Dell Match Play when you’ve got 32 matches going is one of the most exciting days viewing all year really.

“I think golf has got to move with the times and become more heat-of-the-moment, volatile and impactful right from the word go. Certainly if you do it like the team aspect, there’s more action happening in more different places.”

Massive appearance fees have helped attract a world-class field to Royal Greens Golf and Country Club for the Saudi International, with Westwood joined by the likes of Poulter, Johnson, Bryson DeChambeau, Phil Mickelson, Tommy Fleetwood, Sergio Garcia and Shane Lowry.

The tournament was previously part of the European Tour but is now the flagship event on the Asian Tour, which is being revitalised by a 300 million US dollar investment from Saudi Arabia’s Public Investment Fund.

PGA Tour members were only granted releases to play in the event on condition of future support of the AT&T Pebble Beach Pro-Am in California which is also taking place this week, a tournament won five times by Mickelson and twice by Johnson.

“The players of the other tours see the Asian Tour as a threat now, don’t they, because of the huge investment,” Westwood added.

“It’s kind of like a game of poker really where the European Tour and the PGA Tour have had the biggest hand, and now there’s somebody else come to the table with more chips, so everybody is on their guard and very defensive and are clearly seeing the Asian Tour as a threat.

“Nobody can deny that. There wouldn’t have been all this trouble with releases and things like that if that wasn’t the case.”