The Professional Footballers' Association have visited Carlisle in hospital.
In a short statement it said: "Everyone at the PFA is keeping Clarke Carlisle in their prayers and thoughts.
"We visited Clarke at the hospital yesterday and we are offering our full help and support to him and his family at this difficult time."
Footballers who know Clarke Carlisle as a colleague and former chair of their players' association have tweeted their shock at the news of his involvement in a collision with a lorry.
Just heard the news about Clarke Carlisle. My thoughts are with his friends and family.
Shocked to hear the news tonight about Clarkey, thoughts with him and his family. Pull through mate
The world of football pledged its support and best wishes to former Professional Footballers' Association chairman Clarke Carlisle following reports he had been seriously injured in a collision with a lorry on Monday.
North Yorkshire Police said a 35-year-old man was airlifted to hospital after a serious incident involving a lorry and a pedestrian on the A64, near York, on Monday morning.
The force would not confirm the injured man's identity, but last night social media was full of messages from well-wishers hoping Carlisle, 35, makes a quick recovery.
The Football Association tweeted: "The thoughts & prayers of all at The FA are with Clarke Carlisle & his family at this sad time."
Anti-racism organisation Kick It Out, for which Carlisle is an ambassador, posted: "The thoughts and prayers of everyone at Kick It Out are with Clarke Carlisle and his family. Stay strong our dear friend - keep on fighting."
And the Football League added: "Our thoughts & those of everyone that watches Football League clubs will be with Clarke Carlisle and his family this evening."
Police have appealed for witnesses to the collision on the A64 near the village of Bishopthorpe, at 7.30am on Monday.
"The collision involved a male pedestrian and a lorry.
"The injured man has been airlifted to Leeds General Infirmary with serious injuries.
"The road was closed to allow the air ambulance to land and to allow collision investigators to examine the scene."
Carlisle played as a centre-half for a number of clubs including Burnley, Blackpool, QPR, Leeds, Watford, Northampton and York.
After he stopped playing, he worked for the PFA and was also a regular on TV - both as a pundit but also as a contestant on the long-running Channel 4 quiz show Countdown and a guest on the BBC's Question Time.
He has also presented a TV documentary about racism in the game and another Football's Suicide Secret - about mental health issues among his fellow professionals.
It is understood that former Leeds United and York City player Clarke Carlisle is being treated at Leeds General Infirmary after being hit by a lorry.
Police are appealing for witnesses to a serious collision on the A64 near Bishopthorpe in York at 7.30am on Monday.
North Yorkshire Police would only confirm that an injured man was airlifted to hospital with serious injuries.
The thoughts & prayers of all at The FA are with Clarke Carlisle & his family at this sad time.
Our thoughts are with former defender Clarke Carlisle and his family following tonight's sad news.
A plane full of families from our region who either are seriously ill, or have been in the past, has taken off on a dream trip to Lapland. The annual trip is organised by the charity When You Wish Upon A Star. The flight goes to and from Finland in a day giving each child the chance to meet Santa.
At this time of the year you'll probably hear people singing a lot of Christmas carols. But imagine if you want to join in the fun but can't hear the music. That's not stopped youngsters from Doncaster's School for the Deaf from performing festive tunes. After appearing at the town's Frenchgate Centre, they put on a very special performance for Calendar.
Volunteers from the Huddersfield Chapter of the Ahmadiyya Muslim Youth Association (AMYA) visited Children’s ward at Huddersfield Royal Infirmary Hospital delivering gifts to spread seasonal joy.
The initiative is part of the AMYA’s national ‘Muslims for Humanity’ campaign. Its volunteers are aiming to bring a smile to the vulnerable and sick over the winter.
As a youth charity we try to educate young people that each of us has a social responsibility to help our local communities, especially those challenged by sickness. We are trying to do this by getting out into the community and offering smiles and some simple gifts. I was extremely touched by the warm response of the local staff who are truly inspirational people.
Emergency services are bracing themselves for one of the busiest nights of the year as thousands of revellers are out across the region on what's become known as 'Mad Friday'.
Bars and clubs can expect to do a roaring trade - last year sales were up more than 100% on a typical Friday night.
But police and medical staff know they will be equally busy - and they're urging people to stay safe and drink responsibly. Michael Billington reports,
Hull City owner, Dr Assem Allam has donated £1.4 million to bring patient treatment in Hull and East Yorkshire Hospitals NHS Trust into the robotic age.
Allam and his family have pledged the funds to buy surgical equipment that will make it possible for surgeons to perform complex operations through tiny incisions with a robot nicknamed, The 'Da Vinci'.
The robot replicates the range of movements of a surgeon’s hand, but unlike open surgery, the robot does this through tiny holes, reducing the pain and blood loss caused by open surgery.
The new equipment is planned to be brought into use in the summer of 2015 once the system and supporting equipment has been installed and the clinical team has completed the necessary training.
Dr Allam said:
I was most surprised to learn that the population of Hull and the East Riding of Yorkshire did not have local access to Robotic Surgery. There are currently more than 40 units installed in Britain, with the majority being mainly in London and the South East of England, but none in the East Riding of Yorkshire. I am always striving for the East Riding to be the best and to support developments that will benefit the local community.
Three quarters of people want to see a lower drink drive level in this country. That's according to a study by Huddersfield based road safety charity Brake. The government says it has no plans to change it.