The Express report that, as things stand, Bayern have no intention of selling the Netherlands international, who hailed the Dutch coach on multiple occasions during their time working together with the Oranje national team.
But the situation could change if Robben publicly states his desire to leave the Allianz Arena. Manchester United are willing to pay up to £24 million to sign the Dutchman, who turns 31 next month.
The idea of Robben demanding to leave Bayern Munich seems unlikely, even if the world-class winger believes he has unfinished business in the Premier League.
The former Chelsea star played in England under Jose Mourinho between 2004 and 2007 - winning back-to-back Premier League titles, two League Cups and an FA Cup in the process - before completing a big-money move to Real Madrid.
Robben has won everything at Bayern
After two years at the Bernabeu, Robben joined Bayern Munich, where he has produced the most consistent and outstanding football of his career. Furthermore, he has developed into an even more complete footballer under the management of Pep Guardiola, who arrived at the club following Bayern’s historic treble-winning campaign in 2013.
But having won every major trophy up for grabs - including multiple Bundesliga titles, just as many German Cups, the Champions League, plus the Super Cup and FIFA Club World Cup - Robben could be tempted to re-unite with Van Gaal at another of the biggest football clubs in the world.
Man Utd on course for top-four finish
Manchester United are up to third in the Premier League table following their fifth consecutive Premier League victory, over Southampton at St Mary’s on Monday night, and are currently on course to qualify for the Champions League after a one-season absence from Europe’s premier club competition.
Securing the services of Robben, however, could even allow Manchester United to make a late charge for the Premier League title.
Ultimately, though, it will be down to both Robben and Bayern Munich whether this deal happens. The winger still has two-and-a-half years on his contract at the Allianz Arena, but the Bundesliga giants may consider selling if they believe they’ve already seen the best from the ageing superstar.