The departing Real captain held a farewell media conference yesterday.
"I was hoping that this day wouldn't come," Lucas wrote in a post on social media. "I'm sure that I'm not wrong in saying that we all lose today.
"I personally lose sharing and enjoying my day-to-day work with a real friend, one who received me like a brother from the first day we met in a dressing room that is imposing at first.
"Without you, my path would have been completely different. But why think about that, the reality is that the few years we've spent together will always remain in my memory. The very good moments, the other not so good moments, all of the successes that cannot be taken away from us.
"On the pitch, in the dressing room, we're losing one of our best warriors, the best companion in battle, the best captain in the club's history.
"I won't dwell any more. Everyone knows who you are. See you soon, I'm going to miss you, we're going to miss you. I'm sure our paths will meet again soon.
"Thank you, Sergio Ramos."