Borussia Dortmund have spoilt the home farewell party for coach Xabi Alonso with a stunning 4-2 triumph at Bayer Leverkusen to keep their Champions League ambitions alive.

Julian Brandt, Julian Ryerson, Karim Adeyemi and Serhou Guirassy reversed Leverkusen's two-goal lead through Jeremie Frimpong as Dortmund enjoyed a sixth victory from seven unbeaten games.

Jonas Hofmann got a late second for Leverkusen who suffered their third season defeat, all at home.

Dortmund, in fifth, are all but certain to play in Europe next season and, one point behind Freiburg, can still snatch fourth place for a Champions League berth on the final day next Saturday.

Freiburg finish at home against third-placed Eintracht Frankfurt and Dortmund take on relegated Holstein Kiel.

Frankfurt were held 2-2 by St Pauli which means that Dortmund will move into the top four as long as they win by two goals, regardless of the outcome in Freiburg.

Alonso, who famously led Leverkusen to an historic unbeaten Bundesliga title and the German Cup last season, was honoured by club bosses amid "Xabi, Xabi" chants from the fans, after confirming on Friday he would be leaving after the season, possibly for Real Madrid.

He later also celebrated with defender Jonathan Tah, who is leaving after 10 years, in the stands with the diehards.

"His impact was huge, his aura. He is a top coach and a top person. We took a big step forward over the two and a half years," Tah said.

Alonso said: "It is the end of a super era in my life. Leverkusen gave me the chance to become a coach, They gave me trust and support. I am very proud and I will be forever thankful to Bayer."

Frankfurt failed to secure their Champions League spot with the draw against St Pauli who are effectively safe, three points and 13 goals better off than third-last Heidenheim.

Rasmus Kristensen gave Frankfurt a dream start 24 seconds into the game. Pauli reversed matters from Manolis Saliakas' looping ball into the far corner in the fourth and Morgan Guilavogui in the 16th but Michy Batshuayi drilled the equaliser in the 71st.

Frankfurt are two points above Freiburg and three clear of Dortmund, and their goal difference is just three better than that of Dortmund who have scored three more.

That means they could slip out of the top four with defeat and a Dortmund victory by two goals.