However, despite admitting that his side will be up against it, Smith has insisted that they are capable of winning the tie.
"Obviously Croatia is a tough draw and especially as it is an away tie," said Smith. "In Marin Cilic they have an extremely strong number one player who is currently ranked 11 in the world.
"Ivan Dodig is their current number two singles player and ranked at 54, but as we saw last weekend, anything is possible in Davis Cup."
The two nations last met back in 2007 when Britain ran out 4-1 winners.