The letter, which was written and signed by the Tykes' CEO Gauthier Ganaye, invited Chris to come and see him at any time for a coffee, and even made a joke about the financial windfall they have received from their former player, Alfie Mawson, who recently signed for Premier League side Fulham.
Gauthier also made reference to the mental health charity Mind, which is working in conjunction with every team in the football league this season to promote the benefits of a healthy body and a healthy mind.
Since Chris shared the letter, the tweet has gone viral racking up more than 10,000 retweets at the time of writing and garnering praise and support for the football community.
@CWRyder Absolutely superb! Credit to Gauthier Ganaye and @BarnsleyFC for this! Hope other @EFL clubs are embracing… https://t.co/gUhSnra8zu