The Seleccao were guilty of missing a number of chances throughout the game with Pepe, Nani and Silvestre Varela spurning the best of them.
And they were made to rue those missed chances on 74 minutes as Mario Gomez headed home to give Die Mannschaft the three points that took them joint-top of Group B.
|PORTUGAL TO WIN BY TWO GOALS
|5/1||Portugal are 5/1 to beat Denmark by two goals with PaddyPower|
"We lost because we weren't effective [in front of goal]," the 42-year-old said in his post-match press conference. "We didn't lose because we were inferior to Germany.
"When Germany scored I thought we had the game under control, we were well-positioned defensively, they were a little lucky - it was a bad goal to concede for us."
Bento did however, defend his players, praising their attacking intent later in the game and the way in which they stuck to their own style of play.
"The players didn't lose their identity after the goal, they continued to play in our style and they were able to create dangerous openings - we could've evened the game, but that's the way it goes," Bento reflected.
"We have no reason to be emotionally weak after this game. We have quality, character, personality, we have to keep motivated and now recover well physically."
Portugal will play Denmark in Lviv on Wednesday, looking to get their tournament back on track against De Rod-Hvide after they defeated Netherlands 1-0 in their first game.