Guimaraes has travelled to Spain for Newcastle’s pre-season training camp in La Manga, as planned, following his post-World Cup break.
The Brazil midfielder has been a priority target for Arsenal as the club look to further strengthen after winning the Premier League last season.
Arsenal manager Mikel Arteta would not be drawn directly on Guimaraes over the weekend, but said the club were “very active” and “very ambitious in what we want to do”.
“We need to increase the competition internally,” he added.
“We need to make sure we identify the things that we don’t have in the team.”
Newcastle finished 12th in the Premier League last season, with Guimaraes providing nine goals and eight assists across all competitions.