The absence would only last one year however, when the decision was made to bring the league's numbers back up to 12, Rovers were re-admitted along with Drogheda. The club's fortunes improved after their return and they had three consecutive top half finishes from 1965 to 1967, a feat not matched until 2008 and they also reached an FAI Cup semi-final in 1966 but lost to Limerick after a replay. A significant achievement was made in 1968 when Rovers were able to take full ownership of the Showgrounds, which enabled them to begin work on improving facilities at the venue. One of the worst moments of the club's history occurred in 1969 when the club were beaten by non-league opposition in the FAI Cup for the first time as Longford Town won 2–0 in Longford. Rovers fared better in the cup the following year as they reached their first final in 30 years where they faced Bohs. After the first two games ended scoreless Bohs came out on top in the second replay winning 2–1 despite Johnny Cooke giving Rovers the lead. The following years saw Rovers struggle towards the bottom end of the table, and they had to apply for re-election on two occasions as financial constraints forced the club to adopt a part-time policy. Rovers reached their first League Cup final but lost 4–1 over two legs to Limerick.
