Arsenal are in the market for a centre-forward and have been linked with several options across Europe, but competition for their key targets will be fierce. A Premier League-proven option has been linked in Alexander Isak, but a deal looks incredibly difficult, whilst Viktor Gyokeres is of interest given his outstanding goal record this season. Mikel Arteta does want to strengthen his attacking options, but the recent strong form of Kai Havertz as a striker has perhaps reduced the necessity for an established goalscorer to come in, and a younger prospect could still help improve the squad. Ar…