Ramos has been out for over a month with a calf problem, but the Real captain has travelled to London and Zinedine Zidane confirmed he was ready to return in the second leg of their semi-final against Chelsea.
Former Chelsea star Hazard is also fit to start back at Stamford Bridge, playing in attack with Vinicius Jr and Karim Benzema.
Fellow centre-back Raphael Varane has been ruled out of the trip to Stamford Bridge with a thigh injury, but Ferland Mendy is starts at left-back following a thigh problem of his own.
Real have also been boosted by the availability of Marcelo, who had been called to serve on an election board in Madrid and was a doubt for the game - but he is a sub.
Real Madrid XI: (4-3-3) Courtois; Nacho, Ramos, Militao, Mendy; Casemiro, Kroos, Modric; Vinicius, Benzema, Hazard
Subs: Lunin, Altube, Asensio, Marcelo, Valverde, Odriozola, Isco, Mariano Diaz, Rodrygo, Arribas, Blanco, Gutierrez
Real Madrid travelling squad: Thibaut Courtois, Andriy Lunin, Diego Altube, Eder Militao, Sergio Ramos, Nacho Fernandez, Marcelo, Alvaro Odriozola, Ferland Mendy, Miguel Gutierrez, Toni Kroos, Luka Modric, Casemiro, Fede Valverde, Isco, Sergio Arribas, Antonio Blanco, Eden Hazard, Karim Benzema, Marco Asensio, Vinicius Jr, Mariano, Rodrygo.