The 19-year-old attacking midfielder is currently with Borussia Dortmund II after signing with the club last year. Prior to signing in Germany, Flores was reportedly heavily courted by MLS.
A native of Virignia, Flores has been rumored with a return to the US over the past year. He has participated with the Under-17 and Under-20 youth national teams for the US.
He was left off the U-20 World Cup roster this past summer after appearing for the side during qualifying.
If Flores were to come to MLS, he would be subject to the allocation order, which has been reset after the 2015 season.