David Luiz has had a rough start to life at Arsenal as he has conceded two penalties for the Gunners in only four matches.
The Brazilian centre-back, 32, completed a deadline day move from Chelsea for a reported £8m fee.
And the former Blues star has endured a disappointing start as he cost Arsenal three points against Watford on Sunday at Vicarage Road.
The Brazil international brought down Roberto Pereyra in the final ten minutes of the match and Watford pulled back an equaliser to walk away with a point in their 2-2 draw.
Luiz has conceded two penalties in four Premier League matches for Arsenal, which is bad considering his superb record for Chelsea.
The former Paris Saint-Germain defender conceded only three penalties for the Blues in 160 Premier League matches.
Arsenal legend Martin Keown had warned the Gunners not to sign Luiz as he branded him as "high risk" and argued he would leave them "exposed."
The Gunners were left red-faced after Matteo Guendouzi mocked Watford fans by showing a 2-1 scoreline on his hands as he left the pitch.
But the 20-year-old French midfielder was later trolled by the Watford Twitter account after Arsenal were held to a 2-2 draw.
Arsenal boss Unai Emery told BBC Sport that he "knew that 2-0 was not enough at half-time."
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He added: "Physically they are stronger than us so we want to break the lines from the goal kick and connect to Mesut Ozil, like we did with the first goal.
"We have young players, we are working to improve and they will gain experience from matches like today.
"We can grow up and learn with these mistakes."
The Gunners are seventh in the league and begin their Europa League campaign on Thursday with a trip to Eintracht Frankfurt.
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