Chelsea are angry over Real Madrid's interest in Thibaut Courtois.
Courtois has revealed Real got in touch with him during a spell on the sidelines.
And a Chelsea source told The Sun: "What on earth are they doing sending get-well messages to our players on fax machines?
"Don't they know this is the age of the smart phone?
"A fax sounds terribly old-fashioned — maybe the Madrid carrier pigeon is injured."