The Netherlands international has an expiring contract at his current club, and could be on his way to San Siro this summer
The Rossoneri are looking to add more depth to their defence ahead of the 2012-13 campaign, and it is believed that they view the 30-year-old as a viable addition to their squad.
The right-back has a contract with Stuttgart that will expire at season's end, and he has yet to make a decision about his future.
Boulahrouz has also been linked with Eredivisie giants Ajax, but it remains to be seen whether the defender is interested in a return to his native country to continue his playing career.
The Stuttgart player started his professional career at RKC and also wore the jerseys of Hamburg, Chelsea and Sevilla before joining the Bundesliga side in 2008.