Argentinian Speroni, a three-time Eagles player of the year, is a survivor from the last time Palace were in the Premier League back in 2004/5.
And the 33-year-old has been in fine form yet again to help Holloway's side stay in the promotion mix this term.
"He's been fantastic for Palace," said Holloway.
"Every good team needs a good goalie and I think we're a good team at the moment, so that sums it up.
"He's a wonderful fella, a fantastic person and I'm delighted to be working with him.
"He's been a tremendous goalkeeper over the last few years, certainly one of the best, if not the best, in the Championship. Does he deserve a crack at the Premier League? Hopefully he'll help us get there.
"One of my staff, (goalkeeping coach) George Wood's son suffered a car crash recently - luckily he's okay - and obviously George had to go and be with his boy.
"So Julian took all the other goalkeepers for training instead and that speaks volumes for the lad he is. He deserves to do well and he is a big part of our success."