The 25-year-old goalkeeper is currently on loan with the Italian club from Arsenal but there has been plenty of speculation regarding this future in recent times.
However, Boniek is of the belief that the 23-time Poland international will either head back to Arsenal as their number one or spend another season with the Giallorossi if Petr Cech remains in North London.
"I never meddle with the careers of the national team players, so I do not want to talk much about Szczesny's future," he told Italian radio station Centro Suono Sport.
"Every time I spoke with him he told me that he is happy in the Italian capital, his only thought is to do well with Roma and move forward with them in the Champions League.
"But Cech is already doing well, so it is difficult to guess.