Former West Ham defender Matt Upson expects tonight's Europa Conference League final against Fiorentina to be his last for the club.
And he says winning the ECL would be the perfect way for the Hammers captain to leave the club.
"A lot of captains lead by example because of how they play," said Upson to BBC Sport. "But they might not be vocal or have the personality around the dressing room.
"Declan sets the tone with his performance but he also has the character, voice and personality to go with it.
"I am sure Declan will be thinking about will be his own individual performance. That is the only thing he can truly take care of.
"Then he has to think about how he can influence others. That is mainly from leading by example, by how he starts the game, that first bit of pressure, the first tackle, how he carries himself settling into the game.
"Sealing it with a win is a by-product of that. If you focus on that too much, you can take your eye off the thing that is going to win you the game, which is your individual performance and how you can affect your team-mates.
"His next move? Who knows. But he is capable of going right to the top of the game."