They're undoubtedly Red through and through - but Steven Gerrard and Jamie Carragher recently turned blue for a day to promote a cancer charity.
The Liverpool stars are backing Blue September - a new organisation that aims to raise awareness about cancers that can affect men.
It's estimated 154,000 men a year are diagnosed with cancer in the UK and 81,000 men a year die.
Men in Britain are 60 per cent more likely to develop a type of cancer that affects both men and women, such as lung or bowel cancer. They're also around 70 per cent more likely to die from one of these cancers.
But many male cancer deaths can be prevented through healthy lifestyle decisions and early detection.
Blue September urges men to take preventative action by improving their lifestyle choices and stressing the importance of seeking medical advice as soon as possible if they have any worrying symptoms.
To show their support for the cause, Gerrard and Carragher recently painted their faces blue at Melwood.
Gerrard said: "Putting the blue paint on our faces was a light hearted way of raising a serious message. We can all do our bit to face up to men's cancer. If you think something's not quite right, go to your GP and check it out sooner rather than later."
Blue September was first launched in New Zealand three years ago by MWC Media.
The concept has since been taken to Australia and California and will be given its official UK and Republic of Ireland launch later this month.
Carra added: "It's all about being cancer aware, knowing the symptoms to look out for and checking yourself regularly. That's the way to get ahead of the game. Visit Blue September for help and advice or visit your doctor if you suspect anything might be wrong."
Blue September also encourages support of the Men's Health Forum's charity work.
Comedian John Bishop is another backing the campaign.
The Scouser and lifelong Red visited Melwood today to also have his face painted - and was eager to underline the importance of the project.
He said: "I didn't quite make it in time for training today but it's great to be here at Melwood. As a Red and a bloke I am proud to help raise awareness of Blue September and I hope men in our local community take this opportunity to learn more about the risk of cancer and get checked out."