If you want to create a link which enables you to download a Google Sheet as an Excel file you have at least two options. The options below are valid for a sheet within the nhl.nl domain. In order for this to work you have to publish your Google Sheet first using "File, Publish to the Web" within your Google Sheet in a browser. You can decide which parts you want to publish.
1) Option 1
2) Option 2 does the same:
The key 'gid' stands for an identifier selecting a certain sheet/tab within your Google Sheet. You can find this number in the address bar of your browser when the tab/sheet is selected. In the options above the used key is a random oneLabels: Excel, Google, Sheet