Despite criticising Isak's actions, including going on strike, Gallas believes Newcastle should allow him to leave.
He added: "I think the way Isak has handled this, it looks like he’s been given bad advice from his circle. Simple. (The current situation) That is (a result of) bad advice from his people. But at the same time, listen, I won't only blame him because I also think that Newcastle must take some responsibility for what is happening here. I'm not sure I agree with the approach the club has taken. The player has scored loads of goals every season.
"Last season, he hit more than 20 goals. You’re going to double your money for him with Liverpool’s offer. He gave everything to Newcastle in those last few years, and sometimes you have to let players leave at that point. It doesn’t seem fair to make his life so hard when a huge offer comes in. Some players really don’t care about the clubs they play for, and think only about themselves. They don’t see it as clubs giving them the opportunity, and they don’t think fine, I’ll stay another year. You can’t say that Isak hasn’t given everything for Newcastle since he joined the club. Some of his teammates, if a big club comes knocking, rather than staying for another year and paying the club back, they may be encouraged to act like he has done to ensure that they get a move. Ultimately, Newcastle should let him go."