A series of injuries hampered Mulhall's development during the following season where he was unable to make a single first team appearance for Shamrock Rovers.

Mulhall was released by Shamrock Rovers following the 2008 season but he immediately signed for UCD ahead of the Student's First Division campaign in 2009.

Mulhall overcame his injury problems the previous season to make 34 appearances and score 7 goals in all competitions for UCD as the Students took the First Division title and automatic promotion.

[4] After a second spell with UCD which included playing in the UEFA Europa League qualifying rounds, Mulhall made his first move out of the capital to sign for Limerick F.C.

He played an important role in his first season at Limerick and earned a league winner's medal as the club returned to the top flight as 2016 first division champions.