Borussia Dortmund managing director Hans-Joachim Watzke insists there is no economic need to sell Erling Haaland amid speculation he will remain in Germany until next year.

Haaland netted a double as Dortmund won the DFB-Pokal final 4-1 over RB Leipzig, with Jadon Sancho also chipping in with a brace.

The title is a major boost for Dortmund's hopes of retaining Haaland, who has been linked with Real Madrid, Barcelona, Manchester City and Chelsea this off-season.

Dortmund's uplift in Bundesliga form, which has seen them move into the Champions League spots, has also aided their cause to convince the Norwegian to stay.

"You always have fears in my job," Watzke said after Thursday's DFB-Pokal victory.

"We definitely want to keep Erling with us next season. You can see his value, you saw how committed he is last Saturday against Leipzig, with joy.

"Besides we still have it in our own hands, we just have to win twice more now. We have managed the club solidly for so many years, when we go into the second or third year of the coronavirus, then we have to take out a few loans at some point we will pay them back.

"But there is absolutely no economic need to sell him, regardless of whether it is a Europa League or Champions League."

Watzke also casually revealed that interim head coach Edin Terzic had extended his deal with the club to presumably work as an assistant under Marco Rose.

"Edin Terzic did a great job," he said. "He took over the team in December, it was half dead, and he brought it to life. That is a huge achievement at his first coaching station.

"He's holding the keys in his hand. He extended a long-term contract a few weeks ago.

"He's a Dortmund boy, he lives and breathes the club. If Edin wants to do something different, then we have to work with him. But we won't do that now."

Terzic was delighted with the DFB-Pokal success but remained focused on the bigger picture, with Dortmund determined to confirm a top four league spot with two games to play.

"That was definitely not our best game, but we found the key to success," he said.

"Now we all deserve to enjoy this evening tonight but the season is not over for us yet."

Outgoing Leipzig head coach Julian Nagelsmann, who will finish his time at the club without a trophy, said it was a "painful" loss.

"You can imagine that I'm not doing well but it's not about me, it's about the club," he said.

"It's painful. I know what the headlines are like now… We still have two Bundesliga games that are not that pleasant. I'm not thinking about my move [to Bayern Munich] now.

"I'm proud of the boys. "We weren't the worse team, we just scored fewer goals. Dortmund makes a lot out of a little."