Arsenal have now identified their Champions League last 16 second-leg tie at home to FC Porto as the earliest date for Jurrien Timber to possibly return from his ACL injury. The 22-year-old has been sidelined since the opening day of the Premier League season last August. Arsenal were forced to send Timber for surgery after he sustained an ACL injury just 50 minutes into their 2-1 win over Nottingham Forest. It even risked ending his season early. Timber only joined Arsenal from AFC Ajax last July, as well, as Mikel Arteta sought to add an extremely versatile presence to his defence. The Nethe…