McLaren had a weekend to forget in Montreal after both cars failed to score points. Daniel Ricciardo finished in 11th place and Lando Norris in P15.
They lacked pace and weren't helped when a misunderstanding left the Brit waiting for an eternity in the pits when the team chose to double stack their cars.
The pit stop confusion wasn´t the only problem McLaren had to face since both drivers were clearly seen out of pace compared to their closer competitors like Alpine.
Seidl couldn´t hide his disappointment after the Grand Prix and summarised the pitfalls of the weekend.
"Obviously a disappointing day for us, a highly disappointing weekend for various reasons," he said.
"Reliability issues, an operational issue today in the race, but also in terms of pace, and where we want to be.”
On the communication error that sentenced Norris race, Seidl talked about a communication error.
"On the operation side during the pitstop today, we had a communications issue that was in the end snowballing into this issue that we have seen. We need to analyse and come back stronger."
By the time of the media session details needed to be assessed.
"Obviously, I don't want to go too much into detail, because it's something we have to review internally, as a team, what went wrong there.”
However, it seemed clear that it was about communications.
"In the end it was down to a communications issue within the team and that was causing the delays then."
The pitstop was not the only problem and Seidl accepted issues that stopped Ricciardo from staying in the top 10 after the Safety Car.
"On both cars towards the end of the race, we had to manage some parameters, the brakes, and therefore it was not possible for Daniel to keep up the pace and to attack."
McLaren has lost ground in the Constructors championship standings with Alpine closing the gap to seven points in the battle for fourth place. Seidl accepted that the last two races have not been good enough against their midfield rivals.
"If you look at the last two races, there's definitely a trend that we have been falling back compared to Alpine especially.
"And also some other cars were showing signs of strong improvements like the Astons on Friday.”
"We need to up our game in all areas, like I mentioned before, reliability, operations, performance, to make sure we stay in this battle for P4."