On 9 August 2014, Stekelenburg joined French club Monaco on a season-long loan. With Danijel Subašić as Monaco's starting goalkeeper, Stekelenburg was preferred for cup matches, making his debut in the round of 16 of the Coupe de la Ligue away to Lyon on 17 December. After a 1–1 draw at the Stade de Gerland, he helped Monaco win 5–4 in a penalty shootout by saving from Jordan Ferri. In the semi-finals on 4 February 2015 against Bastia at the Stade Louis II, it again went to penalties after a goalless draw. He saved from Guillaume Gillet and Giovanni Sio, but Monaco were eliminated nonetheless. His sole Ligue 1 appearance came on 22 March away to Reims, a 3–1 victory. On 1 June, the club announced Stekelenburg would return to Fulham after his season-long loan expired.