As we told you last night, Jack, 27, has signed fresh terms that will run until the summer of 2023 after becoming a key player under Steven Gerrard ever since moving from Aberdeen in the summer of 2018.
Some Gers supporters have been so impressed with Jack’s performances that they reckon he could go on to succeed James Tavernier as captain in the not too distant future, and it seems McAllister is also a massive fan of Jack’s.
Of course, McAllister was a pretty decent midfielder himself in his own playing days, and speaking via the official Rangers website, the ex-Scotland skipper said: “For me, he has been unbelievable from day one.
“He has improved no-end, and you are seeing a midfield player gathering loads of information, experience and being given a bit of responsibility he’s maybe not had in the past.
“You are seeing a player starting to play at the top of his game and it has been a pleasure working with him, and he deserves his new contract without a shadow of a doubt.
“He has been one of our main players since arriving here, and he is very influential, pretty robust, and his training performance as well is way up there.
“I watched him quite a lot playing for Aberdeen when I was working in TV, and I felt he was probably pigeonholed a little bit.
“I think we saw a player who was just there to stop things and to break up play – maybe he was quite happy doing that.
“But, on arrival here, we could see he was capable of much more. Not only does he do that, but in most of our good build-up play, he is at the start.
“He builds a lot of the play for us.
“Looking at our national team, I think the strongest part is in the middle of the park. It is very competitive and there are a couple of players from Celtic who are doing very well, you have young John McGinn at Aston Villa who is doing very well and you have Scott McTominay at Manchester United.
“But, I think Ryan has a part to play. Steve Clarke knows what he does and I think he respects Jacko and I think he has a part to play for the national team.”
What do you think of Jack’s progression since arriving in Glasgow?
Will he eventually go on to become Rangers’ next captain and cement himself in Ibrox folklore?
Let us know in the comments section below…