The tie is due to be played in the week commencing Monday 7th September, with the exact date and kick-off time set to be finalised in due course.
The Eagles' home advantage was confirmed in a preliminary draw – conducted to ensure that teams involved in the UEFA Champions League and Europa League avoid one another at this stage – before we then drew Middlesbrough in the full draw.
Palace once again went in straight in at Round Three this season following our involvement in the UEFA Europa League.
Championship outfit Middlesbrough, meanwhile – who won the competition in 2004 – reached the third round after overcoming Wrexham 1-0 at home in the first round, and then League One team Doncaster 3-1 away earlier this week.
The two teams last met in October 2018, when Boro eliminated Palace from the League Cup in the fourth round, thanks to a long-range effort by Lewis Wing.
If our third-round tie is level after 90 minutes, it will go straight to penalties to decide who advances; extra-time is only used in the Carabao Cup from the semi-finals onwards.
Palace have fallen away to Arsenal at the quarter-final stage of the competition in both of the last two seasons.
Once again this season, every Carabao Cup match is being broadcast live on Sky Sports for fans in the UK. For overseas supporters, selected matches will be made available via the EFL's international broadcast partners.
Ticketing information will be announced in due course.