Havertz says Premier League title is just the start as he sets Arsenal targets for new seasonKai Havertz has set Arsenal the challenge of reaching another level after insisting the Premier League champions cannot afford to stand still if they are to build on last seasons title triumph.Havertz marked his return from Germanys World Cup campaign by scoring the opening goal in Arsenals 4-1 pre-season victory over Girona, making an immediate impact after just three weeks away from the club.The striker admitted he was buzzing to get back with Mikel Artetas squad and believes the hunger inside the dressing room remains as strong as ever despite finally ending the clubs long wait for the Premier League title.I think we can, or we have to go further, said Havertz. You see especially other teams getting better, so we have to step up another level again. I think thats what were all here for, thats what we train for.We want to start strong and reach our goals this season again.That ambition is already being reflected in Arsenals activity away from the pitch. The club continue to pursue Real Madrid superstar Vinicius Junior in what would be one of the biggest transfers in football, while Newcastle United midfielder Bruno Guimaraes is also a major target and could arrive before Arsenal face Real Betis in Dublin later this week.Rather than seeing potential arrivals as a threat, Havertzs message was that competition is exactly what elite clubs need if they are to keep winning.Arsenal have already strengthened one area of the squad with the arrival of Viktor Gyokeres, and Havertz believes the Sweden international has quickly established himself among the worlds elite forwards.I think its quite natural, to be fair, Havertz said of their growing understanding. Hes easy to play with because I know which runs he wants or where he wants the pass.Ive been on that striker position a lot of times as well, so I understand him quite well. We have a top connection on and off the pitch, so that helps as well.I think hes one of the best strikers in the world and playing with him is very easy.The chemistry throughout the squad, according to Havertz, extends well beyond matchdays.I feel like were all fitting very well together, he added. You feel the chemistry in the team, not only on the pitch but also off the pitch. The way we spend time together in the hotel and away from football is amazing. We have a good connection all together and want to start the season very strong.That togetherness was also evident in Girona as several academy players featured prominently after the break, with Havertz praising the impact made by youngsters including Max Dowman.The young players especially were very good, he said. You see how they fit into the team and how theyre doing during the week is amazing. Were all very happy to have them here.While Arsenal are now champions, Havertz insists there is no sense of satisfaction within the squad.Asked whether European glory now represents the next frontier, the German made it clear Artetas side are chasing everything.We want all the trophies, he said. Thats what were here for. We won the Premier League now but theres a lot more that we can do.We have to reach another level to make that happen because we know how long the season is and how hard it is to go through all the competitions. We want to do it better again this year and make things happen again.