Suarez will complete a €75 million move to Barcelona early next week.
"Luis was the best LFC player I played with bar (Steven) Gerrard. Gutted he's gone but was inevitable he would go to Spain one day," Carragher wrote on Twitter.
"It was the right time for everyone he wanted to go we got a good price considering incident at WC (World Cup).
"I would sign one striker as we have (Rickie) Lambert and hopefully a promising Belgian (Lille's Divock Origi) alongside Sturridge - you need four.
"I like (Wilfried) Bony but with all attacking mdf's (midfielders) looks like it will be one striker most of the time Sturridge main man, so price important."
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