Den Ouden made his debut for Valletta in the first qualifying round of the Europa League against Icelandic side Keflavik, scoring a goal in the 72nd minute, to round the match to a 3–0 win for the Maltese side.
Den Ouden made his debut for Valletta in the initial qualifying round of the Europa League against Icelandic team Keflavik, scoring a goal in the 72nd minute, to conclude the match with a 3–0 victory for the Maltese side.