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The Reds hold significant interest in the player and, despite outlaying more than $300 million this summer, could re-enter the market in pursuit of Isak.
He has established himself as among Europe's finest No.
"It depends how strong a football club wants to be
Look, if Liverpool want to buy this player, then they should get on with trying to buy him, and Newcastle have got to be very strong in what they want.
"I don't really care what Alexander Isak wants right now
"If I'm the owner of the football club, the manager of the football club, my job is to make sure that I'm okay
"So if you want to come and buy my player, come buy him or bugger off.
"Don't use all the forces of the fact that you're a football club that achieved something last year, your second Premier League title in 33 years, but you've achieved it now, and in the last five years, your club has re-emerged as a force in English football, dominating leagues.
"But don't use that as an opportunity just to unsettle the player
"Make a bid, or I'm going to make it really, really hard for you to buy this player
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