Rowntree, in his second season of senior rugby, and fellow front-rower Smith will split their time between Tigers and the Students while studying at Loughborough University.
Speaking about the opportunity for the Tigers Senior Academy Squad pair, Head Coach Steve Borthwick said:
“This is a fantastic opportunity for two young men to be part of a quality rugby programme at this stage in their development.
“It’s also a chance for both Jack and Seb to continue to gain valuable life experience and further education at an institution of Loughborough’s standing.”
Rowntree and Smith join Loughborough effective immediately.