The Baggies, currently eighth in the table, look on course to achieve their highest-ever Barclays Premier League finish in what has been an impressive first season with Clarke in charge.
Foster, who is among only a handful of signings the head coach has brought in since his appointment last June, certainly sees no need for a radical overhaul of the playing staff after the campaign finishes.
And the England international is sure that even with the prospect of some considerable money to play with, it is not something Clarke will be looking to do as he contemplates potential transfer targets.
Foster, quoted on www.wba.co.uk, said: "The fans probably think we can bring 10 or 12 different players in with the new TV deal!
"There's going to be a lot more money being pumped into the Premier League next season but you don't want to go crazy.
"You don't want to add too many players because you might upset the good balance that we've got going at the minute.
"I'm sure the gaffer will be sensible and maybe add three, four or five faces."