Dortmund's season is in danger of unravelling after they fell even further behind Bundesliga league leaders Bayern Munich following their 2-2 draw against Hoffenheim over the weekend - although it could have been much worse after they went 2-0 down.
Jurgen Klopp's side are now 12 points behind Munich going into the winter break, while they were on the verge of elimination from the Champions League before a late winner against Marseille put them in the last 16, where they'll face Zenit St. Petersburg.
According to the Daily Mail, all that has added up to prompt Reus, one of the stars of Dortmund's run to the Champions League final last year, to consider his options.
With Mario Gotze already gone and lead striker Robert Lewandowski all but certain to follow him to Bayern Munich, Reus is said to be contemplating jumping ship too.
That could be excellent news for Manchester United, who are said to be interested in landing the German star.
Reus has a £30 million release clause written into his contract that Manchester United may hope to exploit - and manager David Moyes's statement that the club have money to spend following a disastrous summer window will only add fuel to the fire.
Having replaced the newly-retired Sir Alex Ferguson, Moyes only managed to land Marouane Fellaini as his major signing of the summer, despite being linked with a host of top names.
The Manchester United boss says that won't be the case going forward, and that he has the backing of the club to spend big if he chooses to.
“We have got the money and the club will spend," he told reporters. "There is no question about that.
“We were close to a couple of really major signings [in the summer] but, in the end, we didn’t quite get there. Players have chosen other clubs or made their decisions [to stay] elsewhere.”
Manchester United currently sit in 8th place in the Premier League after 16 games.