Sergio Aguero cannot claim to have played a meaningful role in Barcelona's much-needed 3-1 defeat of Valencia, but his Camp Nou debut was a significant step nonetheless. 

A free transfer from Premier League champions Manchester City, Aguero spent more than two months recovering from a calf injury before being included in Ronald Koeman's squad on Sunday. 

Aguero finally took the field in a Barca shirt officially for the first time in the 87th minute, coming on to replace Sergino Dest shortly after Philippe Coutinho's goal sealed the win for the LaLiga giants.

Argentina international Aguero became the third oldest player to debut for Barcelona in LaLiga in the 21st century (33years and 137days) after Lilian Thuram in 2006 (34years and 251days) and Demetrio Albertini in 2005 (33years 159days). 

Back in LaLiga for the first time since leaving Atletico Madrid for the Premier League 10 years ago, Aguero soaked in the adoring welcome as the home crowd chanted his name. 

"Well, that was incredible," City's all-time leading scorer Aguero told Barca TV. "People calling my name, singing my name. It'd be nice to get used to that. 

"I want to thank them on the pitch for that affection. I can't thank them individually but I hope they enjoy my play on the pitch." 

Barcelona have scored at least one goal in each of their previous 18 home games against Valencia in LaLiga (48 goals) – their second longest run scoring at home against them (after 31 between 1939 and1970).

They are unbeaten in their last six games at Camp Nou against Valencia (W4 D2), since a 2-1 loss in April 2016.

"I am so happy to make my debut, I have been looking to this moment," the 33-year-old added. "It was a good debut because we won and that is the most important thing.

"It was great to hear the fans chanting for me and now it is my turn to repay their love."

Any contributions from Aguero would be welcome as he joins a side that had won just three of their first seven league games before Sunday in addition to heavy Champions League defeats to Bayern Munich and Benfica. 

Aguero could be in line to star at home against Dynamo Kiev on Wednesday with Barca looking to secure their first points in Group E, and the Clasico against rivals Real Madrid looms Saturday.