What happened: The 32-year-old served as captain last season after previous spells with Tottenham and Monterrey. He became a free agent this summer.
Why it matters: Janssen gives Portland an experienced center-forward for the regular-season run-in. His non-DP status keeps the club's premium roster flexibility intact.
By the numbers: Janssen recorded 13 goals and seven assists last season, totaling 20 goal contributions.
What to watch: Portland's roster registration and Janssen's first availability date are the next markers.