Minnelli offers McConaughey Oscar
The 67-year-old actress - who won an academy award for her role in Cabaret in 1973 - attended a lunch in New York thrown by Focus Features to boost momentum for Dallas Buyers Club in the run up to the Oscar nominations.
Matthew stars in the true story about a man diagnosed with HIV in the 80s and given 30 days to live. The film sees Ron illegally import drugs from other countries for HIV and Aids because of the lack of approved treatments in the US. He also becomes friends and business partners with a transgender man, played by Jared Leto.
Liza said: "I have nothing to do with this film except that I am a fan of how it was done, of the insight and the way they played these characters. And the fact that you were watching something that wasn't necessarily comfortable but you could not stop watching. It drew you in, whether you wanted it to or not, and that's magic.
"You, crazy Matthew, losing all of that weight - it's one thing to lose all of that weight and to look like that - that's harrowing enough - but then to run like you did, with a body like that? And Jared, I mean, everything that you did - all of the placements, every single second - I felt wonderful for you, proud of you and sorry for you all at the same time, which I think one only feels for your friends. And Jennifer [Garner] was great - she was just f***ng great!
"I haven't seen a movie like that in so long, and I'm so proud to be able to tell everybody."
She added to Matthew: "And honey, if you don't win the Academy Award, I'm giving you mine!"
Voting for this year's Oscars closes on Wednesday January 8.