The Brazilian midfielder and Magpies captain emphasized that the dressing room is determined to keep their most prized assets at St James’ Park.
Guimaraes, reportedly among those frustrated by Isak’s decision to go on strike, spoke candidly on the issue.
"You have the financial fair play and I don’t know if this affects things or not - I’m not under the table to see the circumstance to see what was going on. Football is business," he told the media.
"As a player, we don’t want to lose our best players, if you want to be successful. We have to improve our squad, and I think we did this very well in this summer, we look forward to go again.
“I want to win things. I have never changed my mind and I still look to make history at this club. We have been in the Champions League two times in the last three years, that is unbelievable for us. We have to keep that going. There is a big job for us to do here and I want to be part of this team."