[4][6] Together with his brother, Guillermo, they competed in some cycling tests in London using the alias “Green”, which was an anglicization of their German surname.

[10] Around March 1900, within only a month of his arrival, Escocés was immersed in a three-way controversy with FC Barcelona and Català FC, due to Green and Black (among others) playing a few friendly matches with both Escocès and Català in a very short space of time, causing Barcelona to launch complaints in their direction as they were unhappy about Escocès stars turning out for their city rivals at the time.

[15] Green was Hispania's captain and best player at the tournament, playing a pivotal role in helping his side become the very first Spanish club to win an official title.

[15] Despite his goalscorer prowess, differences with the managers of Hispania about the position in which Green should line up led to his departure and subsequent entry into FC Barcelona, where together with Gamper, Arthur Witty and Udo Steinberg, he helped Barça win the 1901–02 Copa Macaya, the club's first-ever piece of silverware.

[4][5][6] Despite his status as a footballing star in Catalonia, Green only played four matches with Barça, all of which being competitive fixtures at the Copa Macaya,[1] including a 1–0 victory over his former club Hispania on 9 March 1902.

[16] He was an unused substitute in the Barça squad that participated in the very first national tournament played in Spain, the 1902 Copa de la Coronación.

[23] On 15 January 1905, Green made his debut for Catalonia against the Sportsmen's Club at Espanyol's field, the Hospital Clínic, featuring in the attack alongside teammates Sampere and Ponz as the match finished with an unknown score.

[24] On 13 May 1906, he and fellow Espanyol teammates Carril and Ponz abandoned their occupations and made a sacrifice to cover the last minute losses of Catalonia (initially, it was supposed to be the famous champion of Swiss origin Morret) in a match against Madrid FC at the Barça field, helping his side to a 5–2 win.

[26] Even after retiring, Green remained closely linked to Espanyol, since he carried out functions as an accountant on its board of directors chaired by Santiago de la Riva.

[5][22][27] In 1904, in the absence of the technical director, Green and his teammate Ángel Ponz were in charge of directing the training sessions, so he can also be considered one of the first coaches of Espanyol.