Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Nat. | Name | Type | Transfer window | Transfer fee |
| --- | --- | --- | --- | --- |
| GER | Oliver Kahn | Career end | Summer | n/a |
| GER | Bernd Dreher | Career end | Summer | n/a |
| FRA | Willy Sagnol | Career end | Summer | n/a |
| GER | Marcell Jansen | Transfer | Summer | € 8M |
| PAR | Julio dos Santos | Transfer | Summer | Free |
| GER | Jan Schlaudraff | Transfer | Summer | € 2M |
| GER | Sandro Wagner | Transfer | Summer | Free |
| GER | Georg Niedermeier | Loaned out | Winter | € 0.1M |
| GER | Toni Kroos | Loaned out | Winter | Free |
| USA | Landon Donovan | Loan return | Winter | n/a |
Question:
What player had a transfer window of winter, and free as the transfer fee?
Answer:
Toni Kroos