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Mercedes driver George Russell has accused Ferrari of being “selfish” and “silly” in blocking change to the rules to improve safety at starts.

Last week’s opening race in Australia saw a large deviation in start performance across the grid. The worst incident involved a near-miss when Alpine driver Franco Colapinto narrowly avoided smashing at high speed into the back of the slow-moving Racing Bull of Liam Lawson.

Russell said governing body the FIA had looked to modify the rule that led to those problems but said Ferrari were blocking it, without naming them.

Ferrari driver Charles Leclerc leapt into the lead at the start in Melbourne from fourth on the grid, emphasising the impression that the Italian team have the best starts this year.

Russell said the problems were caused by a “very quirky rule” that limits the amount of energy a car can harvest on the formation lap.

He said that the drivers in the front part of the grid were already considered by the systems to be on the lap so their practice start away from the dummy grid counted in the harvest limit, and they then struggled to recharged the battery.

By contrast, those further back could do their launches before crossing the timing line, so could recover more energy before the actual start.

Ferrari benefited because their engine has a different design than those of other manufacturers and is easier to get off the line.

Russell said: “The FIA was looking to potentially adjust that but as you can imagine some teams who were making good starts didn’t want it, which I think is just a little bit silly.

“The FIA did just want to make our life easier and just remove this harvest limit, but people have selfish views and they want to do what’s best for themselves.”

The FIA has the power to impose a change on safety grounds but has so far stopped short of doing so in the hope of achieving consensus.

Ireland lock James Ryan has been ruled out as head coach Andy Farrell makes four changes for Saturday’s Six Nations Triple Crown decider against Scotland in Dublin.

Ryan started Ireland’s wins over Italy, England and Wales, but he was not considered for selection to face the Scots because of a calf injury.

Joe McCarthy returns to the line-up to partner Tadhg Beirne in the second row, with Darragh Murray set to make his Six Nations debut off the bench.

Hooker Dan Sheehan and flanker Josh van der Flier also return to the pack as Ronan Kelleher and Nick Timoney drop to the bench.

Tommy O’Brien is named on the left wing in Farrell’s only backline change.

O’Brien impressed after replacing the injured James Lowe on the left wing in Ireland’s thumping win over England, but Jacob Stockdale was preferred for last week’s defeat of Wales.

While Stockdale marked his return by scoring Ireland’s opening try, Farrell has restored Leinster’s O’Brien, who can also cover the right wing.

Ireland must beat Scotland (14:10 GMT) to keep their title hopes alive before leaders France face England in Paris (20:10) in the final match of this year’s tournament.

Scotland, who are chasing a first championship since 1999, have made three changes for the visit to Aviva Stadium as Max Williamson and Grant Gilchrist form a new-look second row and Zander Fagerson returns at tight-head prop.

Ireland: Osborne; Baloucoune, Ringrose, McCloskey, O’Brien; Crowley, Gibson-Park; O’Toole, Sheehan, Furlong, McCarthy, Beirne, Conan, Van der Flier, Doris (capt).

Replacements: Kelleher, Milne, Bealham, Murray, Timoney, Casey, Frawley, Aki.

Scotland: Kinghorn; Graham, Jones, Tuipulotu (capt), Steyn; Russell, White; Schoeman, Turner, Z Fagerson, Williamson, Gilchrist, M Fagerson, Darge, Dempsey.

Ryan’s absence is a blow for Farrell with the experienced second row having impressed in recent weeks.

While Ulster captain Iain Henderson has been called up, Farrell has placed his faith in 24-year-old Connacht player Murray, who made his Test debut in Ireland’s summer tour to Georgia and Portugal last year.

The return of Sheehan and Van der Flier – who both started the thumping 42-21 win over England at Twickenham three weeks ago – also ensures the Irish pack is not short of experience.

With Andrew Porter, Paddy McCarthy, Jack Boyle and Jeremy Loughman all sidelined, Farrell has stuck with O’Toole at loose-head prop.

O’Toole has played most of his career as a tight-head but started in the number one jersey against Wales. Michael Milne will provide loose-head cover on the bench.

Tadhg Furlong, who endured a frustrating night against the Welsh scrum last week, is retained at tight-head with the experienced Finlay Bealham on the bench.

Alongside O’Brien in the back three are full-back Jamie Osborne, who has scored three tries in this year’s tournament, and in-form right winger Rob Baloucoune

Farrell has opted for a five-three split of forwards and backs on the bench for the third game in a row.

Craig Casey has edged out last week’s debutant Nathan Doak as scrum-half cover while utility back Ciaran Frawley is retained among the replacements.

Centre Bundee Aki is poised to make his first appearance of the tournament after returning from suspension.

Aki was available for the Wales game but did not make the matchday squad.

Scotland will arrive in Dublin buoyed by their stunning 50-40 win over France at Murrayfield last weekend.

Ireland will guarantee the title if they secure a bonus-point win over Scotland and England overcome France.

An Ireland victory without a bonus point will be enough if France lose and only earn one bonus point.

A draw or defeat by Scotland would end Ireland’s title challenge.

If Scotland beat Ireland at the Aviva Stadium (14:10 GMT kick-off), and England shock France at the Stade de France, the title will be theirs.

A Scotland bonus-point win and a regulation four-point victory for France would also be enough for a first Six Nations title.

A draw would be enough if France lose without collecting two bonus points.