Only the clubs in the game are in the data; spells at other clubs, loans and youth years may be missing.
Which club pairs is Christian Keller an answer for?
In Who Played Both, if two of these clubs meet, Christian Keller is one of the right answers.
- Lazio – Torino 82 players
Source: Wikidata (CC0), Wikipedia club articles and player infoboxes (years at each club). Youth spells and appearances that look unplayed are left out; volunteer-kept records can contain gaps or errors.