user: Question: What is the name of the player with a transfer window in Summer, an Undisclosed transfer fee, and is moving from Brussels?
Columns: ['Name', 'Country', 'Type', 'Moving from', 'Transfer window', 'Transfer fee']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Bernárdez', 'HON', 'Transferred', 'Motagua', 'Winter', 'Undisclosed']
SQL:

assistant: SELECT "Name" FROM "Table" WHERE "Transfer window" = 'Summer' AND "Transfer fee" = 'Undisclosed' AND "Moving from" = 'Brussels';