~Snip
If we refer to the odds given by the bookmaker, of course the home team has a greater chance of winning the match because Dortmund itself has been in very poor condition and you can see that in the Bundesliga through the results of their matches recently. So the small odds on Sporting Cp are proof that the home team also has a chance that exceeds Dortmund even though both of them might score goals in the match. And I also think that their match will be quite fierce in the near future.
You can say Dortmund are not at their best in the Bundesliga, but Dortmund are much better than Sporting in the Champions League. Sporting were just lucky not to be disqualified from the playoffs considering they were the same on points as Dinamo Zagreb, that's because Sporting had better goal statistics.
Dortmund are just 1 point away from last place to automatically qualify for the round of 16, so I would have to disagree if Sporting were completely favourites. Even if Sporting can hold Dortmund to a draw in the first leg, I am sure Dortmund will win the match in the second leg. The existing odds do not indicate anything, meaning Sporting is not convincing enough to win at home.