Former Port Vale midfielder George O'Callaghan is impressing while on trial with the Blues. O'Callaghan, 27, is currently with Eircom League side Cork City back in his native Ireland.
Boss Jim Magilton told the club site: "George has been with us this week and has done well in training.
"We are having a look at him and he'll stay with us for next week, and we'll take it from there."
An attacking midfielder, O'Callaghan started his professional career at Port Vale as a striker but moved to midfield after switching to Cork in 2002. After 39 appearances and four goals over four years and interest from Spurs at one point, he had drifted out of the first team picture at Vale Park.
O'Callaghan was named Port Vale's Young Player Of The Year in 1997 and also won an LDV Vans Trophy winners medal in 2000/01. Capped at U18 and U20 by the Republic of Ireland, O'Callaghan has won a Munster Senior Cup medal and an Eircom League winners medal with Cork. In 2005 he was named the Eircom League player of the year.