The 22-year-old front-man netted 13 goals in 15 outings for the Dutch side in 2008/09 - including four in one match against Roda JC - having scored 18 the previous season.
However, the youngster shot to fame during the recent U21 European Championships in Sweden, where Berg bagged seven goals in four matches as the hosts eventually bowed out on penalties to England at the semi-final stage.
Liverpool, Everton, Ajax, Stuttgart, Fiorentina, Lazio and Villarreal have already been linked with the starlet's signature this summer.
While Premier League pair Tottenham Hotspur and Aston Villa were the reported front-runners in the race to acquire Berg's services, after Groningen director Hans Nijland revealed that two English clubs were keen on the whiz-kid.
However, Nijland has now added that Groningen have also held talks with Hamburg, and that Berg is believed to prefer a switch to Germany over England.
"I can confirm that we have had a personal meeting in Germany. Hamburg's interest is very serious," he told Aftonbladet.
"I am expecting a call from Hamburg any moment. Hopefully we can have a meeting in Groningen.
"We have discussed the clubs with Marcus and his agent Soren Lerby and have been advised that Hamburg is Marcus' first choice."
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