His dismissal was the third time in five league games this season that a Chelsea player was sent off, as many as in their previous 73 games.
Wenger's Chelsea counterpart Antonio Conte refused to make a direct comment about Luiz's sending off but queried how his side had the habit of never ending with a full complement of players against Arsenal.
Arguably they should at least have got on the scoreboard but their record signing Alexandre Lacazette missed an open goal in the first-half.
The Brazilian was given a red card by Michael Oliver for a rash challenge on Sead Kolasinac in the 87th minute of what was an otherwise boring game, but Conte felt that Sanchez had fouled him in the build-up to the tackle.
"It was excessive force, yes", said Wenger.
Burnley 1-0 Crystal Palace
They were lucky to create any chances at all in their 2-0 loss to Swansea with how boring they looked going forward. On each occasion, Palace have had vast amounts of possession and done little constructive with it.
SpaceX launches US Air Force's super-secret mini-shuttle
Together, the two X-37Bs have completed four space missions, each of which has set a new duration standard for the program. The X-37B is the first uncrewed space plane for the US , and is designed for reusability at a reasonable cost.
Wenger's side were savaged by former players and pundits after the 4-0 loss at Liverpool last month but showed far greater steel on Sunday and a point was the least they deserved. I think Kolasinac was not completely on his feet.
"For sure it's odd".
Following today's result, the reigning Champions now have 10 points after five games, the same total we had at this stage past year. A odd situation. Yes. "With a bit more freedom we would have won the game". And while recent history at Wembley - which included FA Cup final and Community Shield victories - gave Arsenal more optimism than usual, playing at Chelsea's hostile home ground is always a daunting prospect for any team.
Singapore to continue hosting Formula 1 Grand Prix until 2021
The Singapore GP has generated 1.4 billion in Singapore dollars (about $1 billion or 870 million euros) over the past decade. Liberty Media had taken complete control of F1 in January, ending Bernie Ecclestones 40-year reign at the helm of affairs.
North Korea warns US, Japan, South Korea against sanctions
Moon said Wednesday that the situation could get out of hand if North Korea's missile and nuclear tests aren't stopped. Nikki Haley has dismissed the Russian-Chinese roadmap, saying the United States is "done talking about North Korea".