Zeigler transferred to Pitt in April after starring the past two seasons at Central Michigan University.
"Trey was hopeful he would be eligible to play this year," Dixon said. "Our associate athletic director Dan Bartholomae has been outstanding throughout this entire process with the NCAA and we are all very grateful that it worked out in Trey's favor."
A 6-foot-5, 203-pound guard, Zeigler will provide Pitt with an immediate infusion of experience and versatility this season. In his two years at Central Michigan (63 games), Zeigler compiled 1,011 points (16.0 ppg), 382 rebounds (6.1 rpg) and 146 assists (2.3 apg). He scored 20 or more points 19 times and reached double-figure scoring in 54 contests.
As a sophomore this past season, Zeigler was named All-Mid American Conference (third team) after averaging 15.6 points and 6.7 rebounds per game.
A consensus national top-30 recruit out of Michigan's Mount Pleasant High School, Zeigler turned down scholarship offers from Duke, Michigan and Michigan State to play for his father, Ernie Zeigler, at Central Michigan. Ernie was an assistant coach at Pitt from 2001-03, helping the Panthers to two Big East regular-season titles, a Big East Tournament championship and a pair of Sweet 16 appearances in the NCAA Tournament.