With Alexis Sanchez's move to Manchester United apparently imminent after a weekend medical, Arsene Wenger's side set about soothing the concerns of the home fans in style by putting Crystal Palace to the sword with a blistering start.
"We should have Koscielny back, we should have Monreal back available for Saturday".
Iwobi had the game's first chance, but saw his shot tipped over by Palace goalkeeper Wayne Hennessey and from the resulting corner Monreal arrived unmarked to head home Granit Xhaka's delivery easily.
The first corner of the game merely five minutes into proceedings saw Monreal latch onto the in-swinging delivery at the back post where he was allowed to head home without opposition - a goal which proved to be an ominous sign of things to come for the visitors.
The result keeps Arsenal in sixth place - two points behind rivals Tottenham who have a game in hand against Southampton tomorrow (4pm).
After their encouraging goalless draw against league leaders, Manchester City, Roy Hodgson's troops have won back to back league games, against Southampton and Burnley and thus, they are certainly a side against whom Wenger can not afford to be complacent.
Arsenal beat Crystal Palace 3-2 in last month's corresponding fixture.
Cech produced a similar save at the other end as Christian Benteke found himself free on goal, but his wait for a 200th Premier League clean sheet continued as Milivojevic pulled a goal back with a well-taken volley.
Palace improved in the second half and could have had a penalty kick with Zaha going down in the box under a challenge from Mohamed Elneny but nothing was given.