The Red Bulls have yet to release a list of who is at camp in Florida. However, it appears that second round pick Stefano Bonomo is not with the team and is on trial in Poland with Miedź Legnica. This is a (translated) report from 90minut.pl.
Recently appeared in the team California Golden Bears university. 22-year-old striker a few days ago, he was drafted by the MLS New York Red Bulls, but he decided to try his hand in Europe. He was also appointed to represent the United States under the age of 18. By 2014, he played 17 matches and scored twelve goals.
Here is a(nother translated) report from www.miedzlegnica.eu, which is Miedz Legnica's official website and features him wearing a team jacket (so I guess it's pretty serious).
22-year-old American with an Italian passport Stefano Bonomo will be tested by the copper. Forward a few days ago, he was drafted into the MLS by the New York Red Bulls, but wants to try his hand in Europe. Previously appeared in the team of the University of California. He was also appointed to represent the United States under the age of 18.
Miedź Legnica is a club that plays in the I Liga, which is the second tier of Polish soccer. He is expected to appear in a friendly on Wednesday against Ślęza Wroclaw.
The Red Bulls selected Bonomo, out of UC Berkeley, with the 39th pick. He holds an Italian passport so we probably should have seen it coming that he would test the waters in Europe.
The off-season has been going great for the Red Bulls, thanks for asking.