He has stressed his confidence Liverpool will be stronger next season, despite the additional commitment of the European games, and the indications are that there could be new defenders recruited over the summer.
Rodgers, whose side have not played in Europe this term, said: "I've watched it (the Palace match) three times since and I'm still in shock when I see us end up drawing the game 3-3.
"To have that much control and good concentration and organisation in the game, for it to slip with 12 minutes to go shouldn't happen.
"If you can't keep your concentration long enough, you'll lose your place. It's as simple as that - you'll lose your place in the squad.
"We've played in big games this season and showed real solidity defensively - but we went away to Cardiff and yes, we scored six goals, but we conceded three; went away to Stoke, scored five and conceded three; Palace three; Hull three.
"Yes, there's an element of quality from the opponent, but I look at and analyse the games intensely and a big part of it is concentration - organisation, concentrating on your job.
"But our work is continual. We will really focus on that part of our game over the course of pre-season.
"Like I said when I came in, we had to improve our goals tally, so we went from 47 scored in a season (2011/12) to now 99 and whatever it finishes at this weekend - and we'll do the same with the defence."
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