Arsenal need to take action ASAP, otherwise other top teams will sign Gyokeres. It's not impossible if Manchester United, Liverpool, Barcelona, Milan, or other teams that currently have old/not reliable strikers to recruit him because he's really promising.
If he moved to Liverpool, Arsenal lose two thing, one is Gyokeres and another one is they will face Liverpool with better strength.
I guessed Arsenal may little to no competitors in getting Viktor Gyokeres, in January transfer window because most clubs has an active 9 already but in the end of season, they may consider the performance of their 9 or rather opt for Viktor Gyokeres since has been on fire notably since last season till now, though if the Gunners can fet him and he's able to replicate same form at Arsenal then I wonder what else would actually limit them for winning the Premier League