The Saints manager is wary of a Sunderland backlash following their 6-2 defeat to Everton last weekend.
The Saints are so far unbeaten on the road this season, having drawn four and won one on their travels in the Premier League.
They have only conceded four goals in that fine run, meaning they are going into every away game confident that they can keep their opponents out.
And Koeman says that the key aspect in all of those games so far has been solidity and understanding at the back.
"First of all, I think we have a good organisation in the team,” he told saintsfc.co.uk.
“We are strong defending, we are very strong in defending set pieces and we have people in front who can score and who can create chances to win the game, but I think in all the away games every time was very solid defensive organisation.”
Koeman’s side will be keen to continue that form when they travel to the Stadium of Light to take on Sunderland this weekend.
They will be confident of securing the points as well, with the Black Cats currently sitting 19th in the table and coming into the game after a heavy 6-2 loss to Everton last time out.
However, the Dutch boss believes they will be keen to bounce back from that defeat and says his side must be on top form if they are to secure all three points.
“They had a big loss last week and they will react,” he added.
“The confidence is very good in the team and, of course, it's a help that you see that you still are unbeaten, but you have to fight, you have to work hard for that.”