He was sent out to a Scotish team for the last season I think ... and yes I think as far as all the young fullbacks are concerned - Lynch should be consider one of the most experience ... and I believe he's quite a lanky lad, which is what I think necessary.
Other than that - I think Roche was away with Wrexham for a while so he is one to be considered... At the meantime, Tierney was playing for the Ireland U-21/19 team in a tournament lately and I suppose he has started to show his potential .... I reckon he already have a senior team's number ... He and Tate were actually 2 of our best young CB/defenders around ...