An old Crystal Palace academy player made a return to the U21 side on Monday in Brendan Kiernan. The 31-year-old’s name may not ring a bell amongst the Selhurst Park faithful, as he eventually moved to AFC Wimbledon and signed a professional contract with the League Two outfit instead of the Eagles. Now – however – Brendan Kiernan is back at Crystal Palace in a development which has left a few fans quite confused… Brendan Kiernan appears as trialist for Crystal PalaceWell, you do not often see a 31-year-old play a trial match for a Premier League side. Kiernan was named on the bench as ‘triali…