Rangers midfielder Maurice Edu endured pain at both ends after netting twice in the 1-1 Champions League draw against Valencia at Ibrox.
Edu headed home in the 34th minute following a sustained spell of pressure from the home side, taking a punch from Valencia goalkeeper Cesar Sanchez in the process.
But he did the same at his own end seconds after half-time as Rangers passed up a string of chances to open up a commanding four-point lead over the Spaniards.
Edu told Sky Sports 4: "The first goal I didn't have time to celebrate because I took a knock on the head and was laid on the ground for a while.
"The own goal, I saw it late and the next thing I know it hit me and it was in.
"I was trying to mark the guy in front of me and it looked like he was going to get it and at the last minute it hit me.
"That was obviously disappointing but we kept going and created more chances."
Kenny Miller, Richard Foster and Steven Naismith all missed glorious chances as Rangers kept up their unbeaten start to their Champions League campaign.
Edu added: "We're pleased that we have played the way we did. We didn't just sit back and absorb pressure.
"We tried to go forward and create chances. We're definitely disappointed because I thought we created the more dangerous chances and we were unlucky not to finish a couple more."
But Edu believes the performance will give them cause for hope ahead of the return match in Spain on November 2.
"We've got to be optimistic," the American said. "We've played three tough matches and had decent results.
"We were unlucky not to win so we'll take confidence and head over there and try to put on another display like that."