Barry Ferguson has revealed that José Mourinho congratulated Rangers after their penalty victory over Fenerbahce.
The interim manager at Ibrox explained that Mourinho, whose team was defeated, offered him a message of support despite criticising the refereeing and lack of VAR intervention in his post-match interview.
Ferguson said: "José Mourinho came into the dressing room and wished me all the best.
"He is one of the best managers there is and I have full respect for everything he has done."
However, Mourinho suggested that Athletic Bilbao, Rangers' next opponent, could prove too strong, saying it would be "phenomenal" if the Ibrox club reached the semi-final.
He said: "In my opinion, I want to be respectful, you know.
"I want to respect the guys, I want to respect the coach, I want to respect the fans.
"In football, anything is possible.
"But, I played against Bilbao in the league phase, and Bilbao is a stronger team.
"And the final is in Bilbao.
"The road to Bilbao.
"So, honestly, I think if Rangers do it against Bilbao, it would be phenomenal because it's going to be very hard."