The Gunners go into the clash at the Emirates Stadium after a morale-boosting Community Shield win over Chelsea.
Walcott said he was impressed by the Bosnian international's physical attributes and work-ethic during the pre-season preparations.
"Sead looks an absolute tank", Walcott said.
"The power he's got and his pace, it's attractive to watch".
"Trust me he's not easy to get around [in training] - he's quite wide as well". He fits perfectly for the Premier League. "This league is the best and I think he could be one of the best in this league".
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"We were missing a lot of players but it's great to see that everybody is ready to compete for places in the squad for every game", Cech said. "We want to be united and together through the season and hopefully we can be happy at the end of the season".
After last season's troubled campaign ended with FA Cup final victory against Chelsea, Arsene Wenger's side are under pressure to challenge for the Premier League title. "For sure there is a bit of frustration, but you know very well we have to respect referees decisions". Henry believes that the 26-year-old French worldwide has improved Arsenal's attack and given them a different option of play compared to Olivier Giroud.
Arsenal legend Thierry Henry has revealed he's a "big fan" of summer signing Alexandre Lacazette. "We're still slowly learning it and it's working for now, and we'll see if it continues to". "I want him to have a chance to play somewhere as well".
The new signing found the back of the net in the 83rd minute with an excellent assist from Granit Xhaka and fans were delighted with his performance.
"I don't know how many times it has happened in history that two players have switched roles like that between national team and club". The home support will be so key this season.