Alan Shearer and John Terry were involved in fierce battles on the pitch when Newcastle played Chelsea, but the pair have now teamed up to tackle dementia.
Shearer is fronting a special BBC documentary looking into the latest science around the disease and the link between it and football.
To help with the programme, he has been interviewing the biggest names in English football, past and present, and his latest meeting has been with the Stamford Bridge favourite.
The pair sat down on Tuesday morning to discuss the topic and afterwards both thanked each other for their time on Instagram.