The Scot has enjoyed a successful first campaign in charge of the Baggies, with the club currently in eighth place in the Premier League table.
"We have been thinking about next season's plans since September last year," Clarke is quoted as saying by Football365.co.uk.
"It's something we're always looking and thinking about, how we can improve what we have.
"It's important we don't stand still, it's important we look to improve the squad we have and give the players we've got a bit of help for next season."
West Brom host Arsenal in the Premier League on Saturday.