"The final decision will be made in January".
Goretzka has scored six goals in 14 appearances for club and country so far this season.
The 22-year-old is out of contract this summer and can thus agree to a pre-contract deal with foreign clubs in January.
Goretzka has also been in good form for Germany's worldwide side, and is out of contract in summer, meaning he could sign a pre-contract agreement at United in January.
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Having yet to agree an extension to a contract that is due to expire at the end of the 2017-18 season, the highly-rated Germany worldwide has become one of the most sought-after players in Europe over recent months with Liverpool, Manchester City, Real Madrid and Juventus among the other European heavyweights rumoured to be keeping a watchful eye on his situation. I play through all the scenarios. "I just need to decide what's best for me, for my career, and I mean to do it not after January".
Last month Germany assistant boss Oliver Bierhoff inadvertently revealed that Goretzka will be joining the vast number of German stars heading to the Premier League.
"We feel that England, because of the amount of money you have with TV rights, young talented players like Leroy Sane and [Schalke's] Leon Goretzka are moving to England and this is not good for our league but also for the quality of our game", said Bierhoff.
Goretzka would be a superb signing for any of the English clubs being linked and it would be a major coup if Arsenal, United or Liverpool were able to win the race for his signature.