The 18-year-old was arrested from a house in Wednesfield at around 4am over the attack on Mr Cruwys.
The victim, a father-of-two described as an 'amazing, lovely man', is in an induced coma and fighting for his life his condition was described as critical but stable.
Det Insp Toni Naylor, from Wolverhampton's Violent Crime Team, said today: "We would like to thank the people of Wolverhampton and the wider footballing community from across the country who have already come to us with information. But I would urge anyone else who can help the investigation to contact us as soon as possible.
"Today's arrest is only the start of our investigation and I would also appeal to anyone who was involved in this incident to do the right thing and come forward."
CCTV footage taken from a security camera in Little's Lane lays bare the barbarity of the sickening attack.
It shows the moment Mr Cruwys was tripped as he tried to flee a gang of thugs, who circled him and then kicked him repeatedly around the head - even when he lies motionless and unconscious.
A £1,000 reward offered by the Express & Star has seen a number of helpful calls to our hotline.
Editor Keith Harrison said last night: "We have held back from publishing the most shocking images at this time but publish some of the pictures in the hope that people will come forward with more information."
Broadcaster Jake Humphrey was among those sharing the images today
Mr Cruwys was set upon after the Wolves and Watford clash at Molineux on Saturday.
He is seen running into view and tripped by a man in a dark jacket. Another man in a blue jacket then takes a huge swing at Mr Cruwys, kicking him full in the head. Others follow in turn, raining blow after blow on the defenceless father, who is a self-employed milkman from Hemel Hempstead, nicknamed 'Moo'.
Wolves boss Kenny Jackett said last night: "Our thoughts are with the lad who was attacked and his family."
The footage was taken outside Carvers Building Supplies. Managing director Henry Carver has passed it to police. He said: "What happened was clearly an act of cowardice. The attackers are like a pack of wild dogs."
Mr Cruwys's friend Amanda Broome said: "The people that are capable of this are sick individuals and need to be brought to justice."
More than £20,000 has now been donated to an appeal set up by Wolves fan Ollie Floyd.