Vertonghen struggled to hide his disappointment after the 1-0 defeat as Ben Watsonâ€™s goal in the 56th minute secured the points for the visitors.
â€śThe team is strong enough to come back from this defeat,â€ť Vertonghen told the Spurs website.
â€śWe have a lot of important games ahead, important games in Europe and difficult away games. We have to stick together. We know weâ€™re strong in away games and we can win at any away ground.â€ť
As for the Wigan defeat, he added: â€śWe had problems with their system, but normally we turn it around.