"First sub" refers to the initial or primary substitute or replacement option. It is the first alternative or backup choice that is considered or used when the original option is unavailable or not working. Full definition
Pre match press conference — must mention the words mentality, cohesion, and consistency Post match press conference, irrespective of the result — must mention the words mentality, cohesion, and consistency Must start Ramsey in whatever position Don't create any specific tactics to stifle Barcelona Must make first sub in the 68th minute (justarsenal.com)
Wengers tactics are make first sub at 70 minutes and continue playing same formation. (justarsenal.com)
I do get that when you have a potential 50 - 60 games a season aches & pains are part of the game... but we have had serious injuries to big players who are regulars in our XI if not as starters than as first subs / starter in between big games. (justarsenal.com)