Without Champions League football and facing a deficit of around 75 million euros ($90 million) in lost income due to the COVID-19 pandemic, Dortmund face a fight to keep the squad intact.
Manchester City travel to Borussia Dortmund holding a slender 2-1 lead and bearing plenty of scars from quarter-final ties over the past three years.
Haaland is under contract with Dortmund until 2024. His transfer fee and wage costs would be out of reach for all but Europe's very richest clubs.
After the match, Haaland was pursued by one of the linesmen, Octavian Sovre, in the tunnel to get an autograph.
City have now won 27 of their last 28 games in all competitions to remain on course for a historic quadruple of Champions League, Premier League, FA Cup and League Cup.
Champions League: Borusssia Dortmund bat off Erling Haaland speculation before Manchester City clash
Signed for just 20 million euros in January 2020, Dortmund reportedly want 180 million euros for Haaland, who has scored 33 goals in 32 games this season.
Already well aware of Haaland's quality, City boss Guardiola has a chance to take a closer look when Dortmund visit the Etihad Stadium for the Champions League quarter-final first leg on Tuesday.
Premier League: Manchester United's Ole Gunnar Solskjaer, Chelsea's Thomas Tuchel play down Erling Haaland talk
Haaland has emerged as one of the world's top forwards after scoring 21 goals in 21 appearances in the Bundesliga this season. Talk of a summer move has intensified after his agent Mino Raiola and father Alf-Inge Haaland were pictured in Spain.
Premier League: COVID-19 fall-out may prevent Manchester City replacing Sergio Aguero, says Pep Guardiola
"There is a big chance, with the situation in the world, the economic problems in world football, we are not going to sign any striker for next season," said Man City boss Pep Guardiola at Friday's press conference.
Bundesliga: 'I don't know anything', Bayern Munich CEO Karl-Heinz Rummenigge plays down rumours of signing Erling Haaland
Haaland's departure could be hastened if Dortmund miss out on next season's Champions League.
World Cup qualifiers: Erling Haaland's Norway hint at pre-match protest over Qatar human rights abuses
Norway players plan to use the fixture against Gibraltar as an opportunity to express their reservations about Qatar's human rights record.
Borussia Dortmund concerns over star striker Erling Haaland possibly missing Sevilla’s visit were eased on Monday when the Norwegian could take a full part in training.
Manchester United's Ole Gunnar Solskjaer 'keeps in touch' with Dortmund-based compatriot Erling Braut Haaland
Solskjaer coached Haaland, the son of his former Norway international teammate Alf-Inge, at Molde and had hoped to persuade the frontman to link up with him again at Old Trafford last season.
Bundesliga: Amin Younes’ goal helps Eintracht Frankfurt edge Bayern Munich; Borussia Dortmund thrash Schalke
Younes, who troubled Bayern’s defense in the first half, was involved in one goal and then scored the other as he helped Frankfurt reinvigorate the title race.
Champions League: FC Porto stun lacklustre Juventus, but concede away goal; Haaland stars as Dortmund beat Sevilla
Such was Juventus' lacklustre performance that coach Andrea Pirlo claimed his team handed victory to FC Porto on 'a silver platter'.
Bundesliga: Erling Haaland spares Borussia Dortmund blushes in Hoffenheim draw; Bayer Leverkusen drop points
Erling Braut Haaland's 81st minute strike averted a fourth defeat in five Bundesliga games for crisis-hit Borussia Dortmund.
Bundesliga: Borussia Dortmund urge Erling Haaland to follow 'world-class' Robert Lewandowski's example
"Erling, and also his agent Mino Raiola, know what they have in us. I can only advise him to do as Robert Lewandowski did," Dortmund's CEO Hans-Joachim Watzke told Monday's edition of Kicker magazine.
Bundesliga: Borussia Dortmund star Erling Haaland out until January, Mats Hummels' injury not as bad as feared
Dortmund coach Lucien Favre has confirmed Haaland "won't play again until January" with a torn leg muscle.
Bundesliga: Erling Haaland ruled out for a month due to muscle injury, says Dortmund coach Lucien Favre
Favre told broadcaster Sky that the Norwegian forward will not be able to play “until early January” and linked the injury to the busy schedule amid the coronavirus pandemic.
From Sociedad chasing consecutive wins record to pressure on Conte at Inter, European football to watch out for this weekend
Here's a preview of the standout football action in Europe this weekend.