Comment and Analysis
The Portuguese attacker collided with Kiko Casilla and was forced to leave training early, causing a concern ahead of Saturday's Champions League final with Atletico Madrid.
Pep Guardiola's arrival at the Etihad Stadium will bring about major changes this summer, even if the Blues only land four or five of their top transfer targets.
The Gunners are set to sign the Borussia Monchengladbach midfielder to kick off their summer spending, with the Colombia international goalkeeper poised to leave the club.
The Italian champion wants to make subtle tweaks to its squad as opposed to wholesale changes, with the midfield especially being targeted.