Barça is playing again in Holland, a country where some of their best players have played in Barcelona and now they are in training in Europe
Barça's history has been related with Holland, specially after Johan Cruyff played and then trained in Barcelona. Moreover, two of the five Champions League have been won by a Dutch trainer. The first with Cruyff and the second with Frank Rijkaard. In this period, between the 90s and the earliers 2000, there where various Dutch players who stayed in Barcelona.
PSV Eindhoven, who is leading with no oposition the Eredivise, is trained by Mark van Bommel, who played in Barcelona and won the Champions League in the 2005/06 season. Van Bommel just played a year in Barça, however he had an important role in the team. For exemple, he played in the Champions League final against Arsenal. His career was related with PSV Eindhoven, where he became famous and where he retired. Now, he is their trainer and his team is being better than Ajax in their league.
Another trainer that is successful as a coach and who also played with Barça and PSV Eindhoven is Ronald Koeman. Currently, he is training Holland national team. After they were not at the World Cup, he has highlighted the team and qualified them for the final of the UEFA Nations League. Also, he won the Eredivise leading Ajax and PSV Eindhoven.
Phillip Cocu was the captain in Eindhoven and Barcelona. He was a physical midfielder with a great career. After he retired, he also started to traing. Now, he has no team, but he trained PSV twice and in his last period he won the Eredivise in the 2014/15 season.
Finally, another Dutch player in Barcelona that is currently training is Frank de Boer. However, he was also an ajacied. As a played, he was 10 years in Amsterdem before he signed for Barça, where he played five seasons. As a coach, he started in Ajax, where he trained six seasons and then he has been at Inter Milan and Crystale Palace.