He struggled to adapt to a more direct style of play in the Premier League.
"It's been a radical change in footballing terms," Feghouli told the club website.
"In Spain, the game is more about possession, technique and strategy, whereas football here is more direct.
Following a couple of appearances as a substitute, Feghouli started eight league games in a row between January and March, scoring against West Bromwich Albion and Crystal Palace.
"It's a big change, but as I said, I'm happy with my statistics so far – two goals and three assists in not many games. I'm gradually settling in," he added.
West Ham, who are currently 12th in the league, visit 18th-placed Hull City on April 1 and sixth-placed Arsenal four days later.
(Reporting by Hardik Vyas in Bengaluru; editing by Sudipto Ganguly)
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