Polvara, 25, joins CITY SC after two and a half seasons in Scotland. The American midfielder had been the subject of transfer discussions in recent weeks, with Aberdeen leaving him out of the matchday squad as negotiations progressed.
St. Louis officials confirmed Polvara has signed a multi‑year contract through 2028 with a club option for 2029. Aberdeen is expected to receive a fee in the range of $200,000, according to Larry Henry Jr. reporting for SBI Soccer.
A former MAC Hermann Trophy winner at Georgetown, Polvara offers a box‑to‑box profile and should provide depth at the 6 and the 8. He previously spent time on loan with the Charleston Battery in the USL Championship before returning to Aberdeen for a breakout campaign.