Forster returned from a 10-month lay-off in a 2-0 win over Watford.
In Forster's absence, the Saints have had capable cover in the form of Maarten Stekelenburg but Forster's absence was sorely missed after making a very positive impression on the side last season following his move from Celtic.
It couldn't have been a better return for the England international either as he kept a clean sheet and his side got back to winning ways.
Bertrand is quoted in the Southern Daily Echo, saying: "It’s a fantastic return for him and a massive boost for us
“It’s good, he fills you with confidence. It’s good to have him back.
“I was fortunate that I kept him going for a few months when he had his injury.
“He’s been working so hard since the day it happened and he’s done wonders to come back so early and be in the condition he’s in is fantastic.”
If Forster finds the kind of form that made the club invest in him, and subsequently, then the chances are the Saints defence will tighten up and he'll be able to play himself into contention for England's Euro 2016 squad, most likely as the deputy to Joe Hart.
Good goalkeepers are in short supply in the Premier League but Southampton have one in Forster and his return to action should be a massive boost for the entire team.