(Inside Lacrosse Photo: Jaclyn Borowski)

With an Ivy League loophole having closed suddenly, star Tiger senior Michael Sowers entered the transfer portal on Thursday afternoon, sources have told Inside Lacrosse.

Here we go: Princeton's Michael Sowers had officially entered the NCAA's transfer portal as of just after 4:00 p.m. EST, according to multiple sources. — Ty Xanders (@tyxanders) April 9, 2020

Ivy League members learned on Thursday that "withdraw and re-enroll" eligibility would be an institutional decision, with Yale and Princeton administrations electing to disallow a loophole that would have created an option for Ivy seniors to play during the spring of 2021 semester.

Sowers, who was IL’s Player of the Year, joins Princeton classmates Connor McCarthy and Phil Robertson in the NCAA Transfer Portal. On Wednesday, McCarthy's decision was considered a precautionary move, but on Thursday, it becomes likely that several of the Ivy League’s top seniors will be forced to play elsewhere next spring, or join the workforce and start a professional lacrosse career.

Check back for more on this developing story.