Arsenal boss Mikel Arteta feels Willian is improving after their FA Cup defeat of Newcastle.
The Gunners won 2-0 after extra time on Saturday.
On Willian, Arteta said: "I think he was improving and improving. The other day he came on really well against West Brom. He's been out as well because he was ill, so he's missed almost two weeks of training and football.
"Today was the first time that he started the game. He had some good moments and he had some other moments that he needed more help sometimes, and some decisions weren't the best. But we're going to keep trying with him.
"He shows in training how much he wants it, he had some highlights in the game and it's about keeping the confidence in him. We know the player he is."
On whether it's hard to keep Willian's confidence up, Arteta added: "I think when the team is winning it's easier because there is more time to do that process. He needs to build the relationship with some players. Today he played in a slightly different position as well. We'll get there."
