Arsenal's Carl Jenkinson remains focused on his club football amid continuing speculation concerning his international future.The fact people are even talking about an England call-up shows how far Jenkinson has come since Arsenal surprisingly signed him from Charlton last summer. After a shaky debut season in the Premier League, his performances have improved vastly with the right-back believing he is now suited to top-flight football. "It has been a whirlwind year," Jenkinson said. "I've realised in football, there's always ups and downs and it's about trying to keep a level head. "You're always going to have downs in football, but at the same time, you're always going to have ups as well and I've just tried to not take the downs too personally and just concentrate on my own game and respond. "I feel comfortable at this level now. I think acclimatised you could say. "I feel comfortable playing at this level now, and I just want to push on from now and hopefully keep going as I'm going."