[2] During the off-season Kostas Stafylidis, Robbie Kruse, Andrés Palop, Son Heung-min and Emre Can were signed.

[3][4][5][6][7] Daniel Schwaab, Hajime Hosogai, Michael Rensing, Dani Carvajal, André Schürrle, and Michal Kadlec were sold.

[13] Nicolai Jørgensen made his loan move permanent and Manuel Friedrich was released.

[15] Bayer Leverkusen announced a three–year partnership agreement with the tourism agency with Austrian state of Salzburg.

[16] The agreement includes an annual summer training camp in Kaprun, at least one friendly against an "attractive opponent" during the training camp, vents in and around Leverkusen, public relations and promotional activities at the club and in North Rhine Westphalia, targeted hospitality measures at the stadium, International press conferences at the training camps, advertising at the BayArena perimeter advertising at Bayer Leverkusen home games, online presence on all relevant channels at Bayer Leverkusen, Salzburg articles in all Bayer 04 Leverkusen print media.

[18] Bayer Leverkusen announced on 12 December that they signed Julian Brandt for the winter transfer period.

[19] The following day, Bayer Leverkusen announced that they brought in Ryu Seung-Woo on loan for a year with the option to purchase.

[22] Bayer Leverkusen are interested in Kevin De Bruyne and met with him and his representative on 16 December.

[24] Bayer Leverkusen started their Bundesliga campaign against SC Freiburg on 10 August.

[30] Stefan Kießling, Son Heung-min, and Sidney Sam scored for Bayer Leverkusen.

Bayer Leverkusen finished the matchday tied for third place in the table with Bayern Munich.

[34] Bayer Leverkusen's goalscorers were Kießling, Sidney Sam (2 goals), and Gonzalo Castro.

[34] Martin Stranzl and Juan Arango scored for Borussia Mönchengladbach.

[36] Schalke 04 won 2–0 with goals from Marco Höger and Jefferson Farfán.

[40] Bayer Leverkusen's goalscorers were Robbie Kruse (2 goals), Lars Bender, and Kießling.

[42] Bayer Leverkusen won 2–0 with goals from Simon Rolfes and Sidney Sam.

[48] On 28 October, the German Football Association decided not to replay the match against 1899 Hoffenheim.

[55] Son (3 goals), Kießling and Gonzalo Castro scored for Bayer Leverkusen.

[55] Maximilian Beister (2 goals) and Pierre-Michel Lasogga scored for Hamburg.

[87] On 29 September, Bayer Leverkusen were drawn against SC Freiburg in the draw for the round of 16.

[91] Kaiserslautern won 1–0 with an extra time goal from Srđan Lakić.

[92] Win Draw Loss Postponed In the 2012–13 season, Bayer Leverkusen finished in third place in the Bundesliga.

[1] As the third place team, they qualified for the group stage of Champions League.

[2] The draw for the Champions League Group Stage happened on 29 August.

[93] Bayer Leverkusen were drawn into Group A against Manchester United, Shakhtar Donetsk, and Real Sociedad.

[93] Bayer Leverkusen kicked off their Champions League campaign on 17 September against Manchester United.

[94] Manchester United goalscorers were Wayne Rooney, Robin van Persie, and Antonio Valencia.

[102] Antonio Valencia, Emir Spahić (own goal), Jonny Evans, Chris Smalling, and Nani scored for Manchester United.