Germany’s foreign ministry on Tuesday has warned against unnecessary visits to three regions of Spain.
In a statement, it flagged Aragon, Catalonia, and Navarra due to their "high infection numbers and local lockdowns."
The regions have seen a huge rise in cases during recent days, but Spanish authorities insist that infections in most regions are under control.
It comes as Germany's Robert Koch Institute (RKI) said negligence was to blame for a recent rise in cases around the country.
"The new developments in Germany make me very worried," RKI head Lothar Wieler told reporters.
The number of new cases in Germany almost doubled on Tuesday to 633, and the RKI has blamed the increase in social contact in workplaces and at parties. It called on people to adhere to social distancing rules.