Arsenal boss Unai Emery is a fan of the 21-year-old, having worked with him in the French capital.
"He has been on the bench after injury, but I think if he will play we will need to stop him because he is a very good player".
"Now I can only say he is working in Roma", Emery said of Monchi.
"It's better to do it with calm and finding the best possible person to do this work".
It is a busy time off the pitch, with Emery stressing that Arsenal are still focused on bringing up to two players in over the winter window, with a wide player and a central defender still on his agenda.
Otherwise, I think Arsenal will field their strongest line-up. "Club knows our intention and is working".
Emery, speaking ahead of Arsenal's FA Cup third round tie at home to Manchester United, said Ole Gunnar Solskjaer's men are a different proposition to the one they faced back in December.
Denis Suarez has played a bit-part role at Barcelona since he joined in 2016 as he has never impressed consistently enough to hold down a first-team place so he has slowly slid down the pecking order. There is no obligation to buy for the Gunners, but consistent good performances for them should be enough to secure a permanent move or get other clubs interested at the very least. Now they are very unsafe.
"They are very unsafe and in a good moment", he said.
Emery evidently did his homework to appreciate why this is a particularly meaningful fixture.
The Gunners may well see this as their best chance of silverware this season, so the focus on coming past their regular foes should be strong leading into the match.