Koscielny, 24, arrived in what is understood to be a £10m switch from French club Lorient, and has already impressed during his two pre-season run-outs, against Barnet and then Sturm Graz. The 24-year-old centre-half accepts it will be a significant step up to the hustle and bustle of English top-flight football, but is relishing the battles which lie ahead. "I like physical challenges and I am a player that can anticipate situations," Koscielny told arsenal.com. "I feel that I read the game well and one of my strengths is challenging for the ball in the air. "However, being at Arsenal, I know that I will have to work harder on all of those points to reach a higher level." When Arsenal return to England, they will prepare for next weekend's Emirates Cup, when the Gunners face both AC Milan and Celtic. By then, Arsene Wenger will want his squad more or less complete, with only the trip to Legia Warsaw ahead of the opening match of the new domestic season at Liverpool. Arsenal are expected to bring in at least another defensive player. Veteran centre-back Sol Campbell could be ready to take up the offer of a one-year extension, while the Gunners are said to be weighing up a £15m bid for Everton defender Phil Jagielka, with Udinese centre-half Cristian Zapata another on Wenger's radar. The Arsenal manager has also made it clear he has yet to settle on his number one ahead of the new campaign. Holland international Maarten Stekeleburg, of Ajax, has emerged as a potential target, with Australian stopper Mark Schwarzer seeming to have been priced out of any potential deal by Fulham, who want around £4m for the 37-year-old.
