Meireles made a transfer request before Chelsea's bid was accepted by the Reds.
"It was a bit of a surprise because of the timing," Gerrard told the Liverpool Echo.
"I don't think Raul had been too happy because he wanted more game time, but the players who have been playing before him have been doing really well .
"He put in a transfer request and I'm sure Kenny and Damien (Comolli) thought if he's going to be unhappy and doesn't want to be here then it was better to move him on.
"It was probably the right decision and we got good money back for him."