Domenico Scala, Fifa's head of audit and compliance: "The next Fifa conference is in May 2016 in Mexico City but as president Blatter has stated it would be an unnecessary delay.

"There needs to be four months notice for any presidential elections. Fifa considers time to vet candidates. The decision for the timing of the election of the next president will be up to the executive committee and will take place any time from December until March."

Secretary of state for Culture, Media and Sport John Whittingdale on BBC Radio 5 live: "I hope football can now come together. The chasm was created by Blatter wanting to hang on. Europe was supporting an alternative candidate and as long as he was there it was going to be difficult to move forward.

"I now hope everyone can come together to make the changes required."

Image source, Richard Conway

More quotes from Sepp Blatter: "I would like to thank everyone who have always supported me as president of Fifa and who have done so much for football."

Sepp Blatter key points:

• Felt a lack of support by people in the world of football.

• Did not want to wait until next Fifa congress in Mexico in May 2016

• "Interests of Fifa are very dear to me and that is why I have taken this decision"

• "What counts most to me is Fifa and football around the world"

• "By stepping down allow Fifa to go further than ever before in terms of reform"

As expected, Twitter has loved the Sepp Blatter resignation. There have been 324,000 tweets with the term "Blatter" in them in the last hour. This is big stuff.

Richard Conway
BBC Radio 5 live sports news correspondent at Fifa, Zurich

"Scala says minimum four months to extraordinary congress. December to March 2016 timescale for new congress."

Aman Sheth: The king is dead, long live the king.

Daniel Johnson: With Blatter finally gone hopefully football can move on, with someone who truly cares about the game.

Send us your thoughts on Sepp Blatter quitting as Fifa president.

Former Football Association chairman David Bernstein on BBC Radio 5 live: "I said all the way through this man is not a man who resigns easy so I just wonder if something has got to him.

"There will be good candidates out there. We need someone who can unite the whole world. We need a real election with genuine candidates and a real choice."

Image source, AFP

So why has Sepp Blatter quit now? He says: "The next congress of Fifa is on May 13 in Mexico and if we waited until then it will only delay matters. I will ask the organising executive committee to organise extraordinary congress to elect a successor.

"The procedure is to be carried out in accordance within Fifa statutes and sufficient time allocated to find best possible candidates. I will not stand I am free from the constraints of an election."

Image source, Gary Lineker

Match of the Day presenter Gary Lineker on Twitter.

More from Sepp Blatter: "Although the members of Fifa gave me a new mandate, this mandate does not seem to be supported by everyone in the world of football - the supporters, clubs, players and those who live, breathe and love football as much as we all do at Fifa.

"This is why I will call an extraordinary congress to be held as soon as possible for a new president elected to follow me with a new election held.

"It is my deep care for Fifa and its interests, which I hold very dear, that has led me to take this decision. What matters to me more than anything is that when all of this is over, football is the winner."

Sepp Blatter says: "I have thoroughly considered my presidency and thought about my presidency and the last 40 years in my life.

"These years were closely related to Fifa and this wonderful sport of football, I appreciate and love Fifa more than anything else and only want to do the best for football and Fifa and our institution.

"I decided to stand again to be elected because I convinced it was the best option for football. The challenges that Fifa are facing have not come to an end."

Image source, AFP

Sepp Blatter says he will resign as Fifa president. He says: "An extraordinary congress is to be called to elect my successor as soon as possible."

Sepp Blatter's news conference is in progress now.

Bilel Mohsni has been banned for four matches and issued with a notice of complaint following his post-match clash with Lee Erwin at Fir Park.

Defender Mohsni, 27, was sent off after the final whistle of Rangers' 3-0 defeat by Motherwell on Sunday.

He is out of contract as of Monday and his ban and any additional suspension will be attached to his registration.

Motherwell duo Lionel Ainsworth and Craig Moore have accepted two-match suspensions for violent conduct.

The duo were involved in separate clashes with Mohsni after Motherwell's victory, which completed a 6-1 aggregate win in the Scottish Premiership play-off final.

Stan Wawrinka has beaten Roger Federer 6-4 6-3 7-6 to progress to the semi-finals of the French Open.

Richard Conway
BBC Radio 5 live sports news correspondent at Fifa, Zurich

"Blatter and Scala name plate now removed from press conference top table. Only De Gregorio remains. What is going on? "

Roger Federer has forced a tie-break in the third set of his quarter-final with fellow Swiss Stanislas Wawrinka.

Wawrinka leads by two sets to love.

Live text commentary here.

Incoming head coach Brian Smith can bring "confidence and belief" to Wakefield Trinity on his arrival this week, says chairman Michael Carter.

Image source, Getty Images

Former Sydney Roosters, Bradford and Hull FC boss Smith, 61, led the former to the NRL Grand Final in 2010 - his most recent coaching post.

He joins a Trinity side bottom without a win in 13 Super League games and currently seven points adrift.

"He comes with a fantastic pedigree," Carter told the BBC Super League Show.

Read the full piece here

Mr Blatter is keeping us all waiting, the conference is now scheduled for 17:45 BST.