There are certainly Germanic DNA in Portugal and Spain, because of the large history of Europe.
I think, there was already some Germanic DNA before the Celts (people) and later the Romans (politics) went to Iberia.
A lot of present Germanic DNA could be of Suevi or Goth origin, but there are also Anglo-Saxons, Franks, Vikings and other Germanic DNA in Iberia. The middle ages brought also Germanic DNA to Iberia.
People who know Iberia can find out that there are lots of isolated locations. Most of them are around the coasts (mountains) and regions like Extremadura.
If in a village or area exists more Suevi, Goth, Franks or other Germanic DNA is often a question of Iberian regional history.
Suevi-Germanic is not Nordic. I would say it could be a variation of North-, Middle- and East-Continental-Europe, where the Suebi-Germanic tribes came from.
I think some people in Portugal and Spain carries a Germanic DNA.
Some of them carries only the Y-DNA, only the mt-DNA or autosomal DNA or more.
We can’t say whether the typical autosomal DNA Suevi is only blond and has got only green or blue eyes, but these characteristics come from North-, Middle- and East-Europe, isn’t it ?
However, I think,the Celts, the Scandinavians and most tribes of East Europe also carried blond hair and green or blue eyes.