After four seasons and 49 La Liga matches for the Cantabrians (adding 33 appearances in a 2002 promotion) he joined RCD Espanyol also in the country, being first-choice during the 2003–04 campaign.
The arrival of Cameroon international Carlos Kameni the following season meant Lemmens was confined to bench duty, with just one Copa del Rey match to his tally.
[2] Lemmens did not manage to play one single game with the Greek side, being demoted to third-choice in 2006–07 upon the signing of Tomislav Butina.
He helped the team finish comfortably in mid-table, but they would be relegated due to financial irregularities and he retired shortly after, going on to work as a goalkeeper coach with K.S.C.
On 24 January 2013, Lemmens was named the new goalkeeping coach of the Red Devils, replacing the departed Philippe Vande Walle.