Arsenal face striker Alexandre Lacazette for injury until October, but chief Unai Emery is more than pleased to continue to give the younger members of his squad a chance.

Midfielder Joe Willock signed a new long-term contract with the Premier League club on Wednesday and is one of many academics who have been under the Spaniard since taking office last summer.

19-year-old striker Reiss Nelson has earned a starter goal this season, and Lacazette's ankle injury, which the club uncovered after Emery's press conference, should give Nelson more opportunities, starting with Sunday's Watford clash.

"It's our philosophy and our idea to give them the chance to train with us, gain confidence and play minutes, and if they get the performance we want, they'll go," Emery said as he went after his young players was asked.

"They can gain experience with us, train with us, play with us and help them with our experienced players and share our way with these players."

He added, "Every player needs their first experience. For me it means training with us every day and giving them the opportunity to show us their mind first, then their desire and their performance.

"We can analyze our preseason, many young players deserve to be with us and we can help them to be with us and spend more minutes in the Premier League, Cups and Europa League games."

Emery confirmed that Nicolas Pepe should be available for the match on Vicarage Road, although he is not on the international service with Côte d'Ivoire.

Nicolas Pepe hopes to compete at Watford for Arsenal
Nicolas Pepe hopes to start for Arsenal at Watford (John Walton / PA).

Former Lille striker and Real Madrid loaner Dani Cellebos and Pierre-Emerick Aubameyang have to score goals. Lacazette has to pause until October.

On Pepe, Emery said, "We decided to leave him here with us, and we worked with him to finish him up for Sunday, and we believe he will be.

"We need people who are patient with him and help him to feel good, to know us and to know the opposition teams.

"Every training and every game is very important in order to be ready and perform (Pepe and Cellebos). I really think the progress is perfect. "

Arsenal is likely to meet former player Danny Welbeck on Sunday, who moved to Watford on five free seasons with Emirates in August.

He was one of Javi Gracia's newest additions to Vicarage Road before being dismissed last weekend after a poor run and replaced by Quique Sanchez Flores.

Emery added, "Danny is a great person and a very good player, he had this injury and is now in Watford and I wish him well."

Welbeck was one of ten first-division teams who finally left Arsenal this summer, although defender Shkodran Mustafi has not left.

He was expected to leave before the European transfer window closes on September 2, but he chose to stay with the Gunners and Emery insists he is now firmly rooted in his plans for further development.

"Some players left and we did not choose this option at the beginning, so when they left, we decided to go on with different options, Mustafi decided to be here, and when he decided to be here, he is like another player, "said Emery.

"I respect his decision. When he decided that I spoke to him and said that you are one more in the squad, I will work with you as other players.

"Since he has decided to stay here, he works every day with great motivation and good humor."