West Brom manager Sam Allardyce: "Another game gone by where we learn more about the players we have. We have learnt an awful lot about what we can and cannot do.
"We need to work out a way of not trying to be as sloppy as we have been at conceding goals. It appears when we try to open up we leave opportunities for the opposition and we cannot cope."
Arsenal manager Mikel Arteta: "We had a big week, three games in seven days, and we managed to win them and everything looks much better. It was difficult conditions but the team looked sharp from the start. It's a big win.
"After the results, we had before we had to lift things straight away. Now we have got some discipline back. We look more creative in the final third and we look solid at the back."