Is anyone aware of open data involving the Portuguese soccer league (Primeira Liga)?
For soccer players, Kaggle hosts the FIFA 18 Complete Player Dataset. Accessing the data requires registration.
17k+ players, 70+ attributes extracted from the latest edition of FIFA
To build a dataset for just the Portuguese soccer league, you would have to download CompleteDataset.csv and build a filter on "Club" for the clubs that are in the target league. Then you have the complete stats for those players.
There are results from the Primeira Liga as well as many other leagues (mostly from Europe) here: http://www.football-data.co.uk/portugalm.php
Goals, results, odds, etc.