The former Aberdeen youngster enjoyed a memorable rise through the leagues with the Dingwall club - even with sight trouble caused by a freak training ground accident.
American midfielder Polvara was ruled out for five months with a hamstring injury which required surgery, but took on an alternative role during the period.
Pitching up at Pittodrie hoping to win a contract, these 25 trialists had a chance to sign for the Dons.
A ragged display v Hibs to lose for the third time in the Premiership this season laid bare Aberdeen's immaturity in defence, writes Willie Miller.
As well as the news on first-choice goalkeeper Mitov, Aberdeen have also been linked with a Latvia international defender.
The Dons visit Killie on Boxing Day - but you'll need the password in this article for your chance to win Dons Score Predictor League £££.
The Dons paid for individual mistakes against Hibs, but lambasting those individuals publicly or behind the scenes will only sow division, writes Duncan Shearer.
The Dons' midfielder will have competitive festive football rather than home town bragging rights on his mind when his side face Kilmanock on Boxing Day.
The Dons manager was frustrated at how quickly his side lost their way in the 3-1 defeat by Hibernian at Pittodrie.
All eyes are on the Boxing Day visit to Dundee after the Dingwall team's last-gasp loss to St Mirren made it four successive defeats.
Administrators BDO and club consultant Alan Savage confirmed 15 interested parties remain keen to buy the League One club... but there's a car park-related hitch.
Aberdeen loan players had contrasting fortunes at the weekend.
