Two trebles in two years — Barcelona 2008-09, Inter 2009-10
Samuel Eto'o is the only African player ever to win two trebles in consecutive years. The Barcelona 2008-09 treble under Pep Guardiola was followed immediately by the Inter Milan 2009-10 treble under Jose Mourinho. Both Champions League final wins featured Eto'o on the team sheet and the scoresheet in the run-up.
Barcelona 2008-09 was Guardiola's debut season at Camp Nou. The squad inherited from Frank Rijkaard, the new false-9 role for Lionel Messi, and the demand that Eto'o accept a wide-right role to accommodate Messi central — Eto'o agreed, the season produced La Liga (won at 87 points), the Copa del Rey (3-1 over Athletic Bilbao in the final, Messi and Eto'o both scoring) and the Champions League final on 27 May 2009 in Rome against Manchester United. Eto'o opened the scoring at 10 minutes, picking out the bottom corner from a tight angle; Messi added the second with a header at 70 minutes. Barcelona won 2-0. The treble was complete.
Inter Milan signed Eto'o in summer 2009 in a swap deal with Zlatan Ibrahimovic, who went the other way to Barcelona, plus a reported EUR 49m. The 2009-10 season was Mourinho's second at Inter. Mourinho asked Eto'o to play as a defensive wide forward, tracking back to support Maicon on the right, dropping into midfield when out of possession, finishing centrally when chances came. Inter won Serie A by two points over Roma, won the Coppa Italia 1-0 over Roma in the final, and beat Bayern Munich 2-0 in the Champions League final at the Bernabeu on 22 May 2010 (Diego Milito scored both goals). Inter became the first Italian club to win a treble; Eto'o became the only player in football history to win consecutive trebles with two different clubs.
The double-treble has rarely been replicated. Pep Guardiola's Manchester City won their first treble in 2022-23 but did not chain a second the following year. The Barca-Inter axis of 2008-2010 is the only documented case of consecutive trebles at top-flight European football — and Eto'o is the central figure of both stories. The 2010 CAF African Footballer of the Year award, his fourth, was the inevitable recognition.