Thomas Frank admitted he had no instant solution for Tottenham's miserable home record after their crashed to a 2-1 defeat against Aston Villa on Sunday.
Frank's side took the lead through Rodrigo Bentancur in the fifth minute in north London.
But once again they failed to build on a strong start as Morgan Rogers struck with a superb strike for his first goal in 20 matches to haul Villa level before half-time.
Villa substitute Emiliano Buendia curled into the far corner in the 77th minute to leave Tottenham with 11 defeats and only three wins from their last 18 Premier League games on home turf.
Frank, hired from Brentford in the close-season, has overseen two defeats in his first four league fixtures at the Tottenham Hotspur Stadium, adding to the club's dismal record there under his predecessor Ange Postecoglou last term.
Asked if he could explain that poor form, Frank said: "I hope I can! Maybe it is not that simple.
"This is a game that is a draw. A clear draw and we could have easily won it instead of Villa and then it is a different narrative.