Willian was not part of Chelsea's squad that faced Arsenal in the FA Cup final at the weekend due to an injury and could possibly have already played his last game for the club. I know the situation at the club's end.
"The problem is they were not consistent but I think overall he has done well".
"It's a double reward for us because it's very important for this club to be in Europe and we've done it through winning this competition again, it's 14 now and we all contributed and I'm so happy".
"He's been brilliant for me this season but it is his choice and I respect his choice".
Lampard also said that Willian has been a great servant for Chelsea and eventually staying or leaving the club, is the midfielder's decision.
Arsenal will be reluctant to risk losing Aubameyang on a free transfer next summer if the striker does not sign a new deal, so the summer transfer window will be make-or-break when it comes to his future.
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Azpilicueta and Pulisic went off in either half during the 2-1 defeat to Arsenal at Wembley, while Pedro was also forced off when he injured his shoulder late on.
Lampard's Chelsea travel to face Bayern Munich in the last 16 of the Champions League on Saturday, albeit with limited hopes of reaching the quarter-finals as they face up to a 3-0 deficit from February's first leg.
On Sunday, Pulisic posted his reaction to the FA Cup Final and said that he'll "be back in no time".
The match was all but settled following Aubameyang's second and Mateo Kovacic receiving a second yellow from Taylor in the 73rd minute.
Chelsea finished the 2019-20 Premier League season in fourth place, and as a result, the side qualified for the 2020-21 Champions League.