"I'm really happy because my intention was to keep playing for Arsenal. I feel really good playing here," Monreal told the club's website (www.arsenal.com).
"I wanted to stay here and I could extend my contract. I would like to play here for many more years."
Monreal, who joined Arsenal from Spanish side Malaga in 2013, has featured in all 22 league matches this season, helping the team keep 10 clean sheets.
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Arsenal host champions Chelsea, who are 14th in the table, on Sunday.
(Reporting by Shravanth Vijayakumar in Bengaluru, editing by Ed Osmond)
