A Premier League manager is worried his £65m-rated striker could leave this summer transfer window after being linked to Arsenal. Mikel Arteta’s side narrowly missed out on the Premier League title last term, so the onus will be to go one better this year and win a first Premier League title since 2004. To do that, he’ll need to be backed in the transfer market and he’s close to adding Bologna defender Riccardo Calafiori to his ranks. Now, attention will start to shift towards the signing of a striker and one Premier League boss is worried his could depart after being linked with a move to the…