FIFA has hit out at “a concerted and ongoing effort by some to undermine” the governing body and president Gianni Infantino over claims surrounding his conduct at Uefa.

Uefa confirmed on Saturday a “departure payment” was made to a female employee alleged to have been in a relationship with Infantino when he was the European organisation’s general secretary.

The Daily Telegraph reported the woman received a six-figure sum and Uefa confirmed a payment was made along with covering the fees for an MBA course, adding it was “in line” with regulations at the time.

The allegations intensify the position of Infantino, who worked at Uefa for 16 years and was its general secretary between 2009 and 2016 before being elected Fifa president, following his aborted plan to sell off stakes in the World Cup to private investors.

While not directly referencing Uefa’s statement, Fifa accused Infantino’s critics of trying to weaken his authority and have him removed from his role without a due re-election process.

A lengthy statement said: “It is increasingly evident that there is a concerted and ongoing effort by some to undermine Fifa and its president.

“Those who do not have the support of Fifa’s member associations should not seek to achieve through allegation, insinuation or misinformation what they cannot achieve through Fifa’s established democratic processes.

“Recent reporting has included unsubstantiated assertions and demonstrably false claims concerning Fifa and its president. Speculation and insinuation should not be presented as fact, and repetition does not make an allegation true.

“The Fifa president has dedicated more than 30 years of his professional life to European and world football, contributing to significant change in the game and, in particular, to broadening access, resources and opportunity across world football.

“Change inevitably challenges established interests, but disagreement with that change cannot justify efforts to undermine the democratic mandate of Fifa’s president or the institution he was elected to lead.

“Fifa welcomes legitimate scrutiny. But scrutiny is not a licence to distort facts, amplify unsubstantiated allegations or manufacture distractions designed to undermine progress. Where reporting is inaccurate or misleading, Fifa will challenge it directly and vigorously.” 

Infantino’s controversial proposal was rejected by Uefa and two other continental confederations. On Wednesday, Infantino was backed by Fifa’s management board following a meeting in Morocco and issued an apology over the process.

Uefa’s threat for its 55-member countries to boycott Fifa competitions until the plan was scrapped remains, with the European confederation saying on Thursday that Wednesday’s announcement “changes nothing.”

Following the Daily Telegraph claims on Friday, a Fifa spokesperson was reported to have told the newspaper Infantino “strongly denies these categorically untrue allegations.”

Meanwhile, Javier Tebas, president of LaLiga since 2013, has become the latest person to call for the Fifa president to resign and believes his position has now become untenable.

Speaking to Le Monde, he said: “For me, Gianni Infantino’s time has long since passed.

“I’m not saying this because of recent events; I have noticed this style of management for a long time, though everyone else seems to be discovering it only now.

“Gianni Infantino is not someone who contributes to the growth of football. On the contrary, his projects are destroying the very essence of the sport: the national leagues.

“Football is not limited to the elite. For me, the Infantino era is over.

“What remains to be seen is when that will take effect and how the succession will unfold. I hope it is not just a matter of swapping out some people for others, but of a genuine overhaul.”