Mustafi out until October, Leno set to train ahead of FA Cup final
Mustafi had a minor operation on Saturday following damage done in the FA Cup semi-final victory over Manchester City.
The centre-back will miss the start of next season as he recovers from the procedure and will be a spectator when the Gunners attempt to beat Chelsea at Wembley on Saturday to secure a Europa League spot.
Mustafi missed the FA Cup final against the same opponents three years ago due to concussion but is taking a positive outlook despite his latest setback.
"Missing out the @EmiratesFACup final for the second time. The good news is that the surgery went well and that I am not the type of guy who gives up easily," he tweeted.
"After the disappointment I accepted the situation and I am now focused to recover to be back on the pitch."
Goalkeeper Leno suffered a ligament sprain in his right knee following a challenge from Brighton and Hove Albion forward Neal Maupay last month and is aiming to be back in full training next week.
Bellerin was not risked for a 3-2 victory over Watford on the final day of the Premier League season last Sunday due to a calf problem, but the full-back is back in contention.