Watford fullback Kiko Femenia could offer no special insight to Atletico Madrid on how to beat Liverpool.
Femenia helped Watford stun Liverpool 3-0 on Sunday.
Asked by Radio Marca if he had advice for the Reds' Champions League opponents Atletico, Femenia said: "There is no secret, in this game the goals happened for us, in the previous one we were not so lucky.
"We were winning 3-0, but there were still 18 minutes left before the final whistle and we didn't relax."
Also during the game, teammate Gerard Deulofeu suffered a cruciate ligament injury. Femenia added: "We are very screwed by his injury, it is a great loss."
Atletico go to Liverpool for the second-leg of their round of 16 tie defending a 1-0 lead.