The Baggies have banished their reputation of being a yo-yo club between the top two divisions by guaranteeing a fourth successive campaign of Barclays Premier League football.
But Clarke knows eighth-placed Albion have to continue to look to strengthen ahead of tomorrow's encounter with Arsenal at the Hawthorns.
He said: "We have been thinking about next season's plans since September last year. It's something we're always looking and thinking about, how we can improve what we have.
"We would like to think that's going to continue, but if you stand still in the Premier League, other teams come charging past you.
"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.
"That's something we will endeavour to do between now and the kick-off of next season.
"Whether they are resolved early in the summer transfer window or whether we have to wait until July-August time, only time will tell."
An experienced football man, Clarke knows how the game works at the top level.
And, as a result, he believes Arsenal's current run without a trophy is just part of football's cycle of different teams enjoying periods of success.
He said: "Normal cycles are where you have periods at the top and then you have periods of not being at the top.
"At the moment, Chelsea aren't at the top either. They have slipped a couple of places down.
"It's just the way it is in football that, at different times, different clubs will be up there challenging and being the main one or two.
"Normally the Premier League boils down to two teams at the end of the season.
"This year it has boiled down to one (Manchester United) which is unusual and not so good for the competition, I don't think."
Clarke also feels Arsenal boss Arsene Wenger deserves time to continue the philosophies he has preached in his 17 years at the club, even though a Champions League spot is by no means assured.
He said: "Arsenal do spend money on attracting younger talents to the club. They bring people in they try and develop through the system which is great if you can do that.
"Mr Wenger had a great start with Arsenal, winning trophy after trophy, so you buy yourself time to be able to develop young players and bring them through.
"Most people at Arsenal would say he has done a great job there.
"If he has a season that's a bit more disappointing than others, surely they are going to stick by him, see it through, give him the chance to keep building the squad and try to challenge for honours.
"People talk about them being in danger of not qualifying for the Champions League but so at this stage of the season are Chelsea and Tottenham.
"Liverpool won't make it, Everton have been up there all year, and it's going to be difficult for them to get there.
"You've got a lot of big teams who spend a lot of money and want to finish in the top four - but not everyone can."
Baggies midfielder Youssouf Mulumbu will start a three-game ban for his sending-off at West Ham but Clarke has a ready-made replacement in James Morrison who has recovered from a hamstring injury.