The Sunderland manager returns to Upton Park this weekend.
Allardyce was in charge at Upton Park for four years, before leaving the club at the end of last season when they decided a change in manager was in need.
He enjoyed a solid spell as Hammers boss, taking over with them in the Championship and helping them return to the Premier League, where they stayed for the entirety of his time as manager.
And he says that he believes he helped to reinvent the club and takes pride in the work that he did there.
“You always want to go back to your own club and do well with the team you’re in charge of now,” he told safc.com.
“I had a really good four years and really took great pride in taking a football club that was lost and reinventing it.
“I enjoyed working with the players, I had a really good relationship with most there but it came to an end and rightfully so.”
Allardyce will now be hoping he can do a similar job with the Black Cats and keep them in the Premier League this season.
They are currently 19th in the table, but just a point behind Newcastle United and Norwich City in 18th and 17th respectively.
That leaves them with a huge chance of avoiding the drop once again, and their manager will be hoping the win over Manchester United last time around can push them to doing just that.