The Reds stopper has been the recipient of some criticism after being blamed for several costly mistakes among the defence this season.
However, the Spaniard has cited injury as the reason for his stop-start campaign for the club, and is not concerned by his performances.
"Some people say I've had a bad season, but honestly I think I only had three poor matches, at the beginning of the year," said Reina.
"It's been a strange season for me because I've missed lots of games with injury. This has been the most unsettled season, both personally and as a team, since I joined the club.
"Liverpool is going through a transitional period, with new ideas and a different playing philosophy. That takes time. People have to be patient. It's normal for us to be erratic."
Liverpool host West Bromwich Albion in their next match on Monday.