Sunderland goalkeeper Rachael Laws has been called up to replace Chamberlain.
England face Belgium at the AESSEAL New York Stadium in Rotherham on Friday 8 April (7.55pm KO) before travelling to Zenica to play Bosnia & Herzegovina on Tuesday 12 April at the NFSiB (3.00pm KO BST).
England have a 100 per cent record so far in their qualifying campaign.
Midfielder Jill Scott, who scored the winner in England’s last qualifier against Bosnia, said: “In a qualifying campaign the most important thing is winning the game.
“Looking back at the Bosnia game in November, people probably thought we were going to win by a bigger scoreline. But when smaller teams play against England now, it’s their cup final. If Bosnia had earned a draw against us it would have been the biggest result of their lives.
“We’ve got to prepare for that to happen more often now that there’s an expectation on us.
“We have to get into good habits and stick to those habits as much as we can.”
Tickets are available for the Belgium game priced £5 for adults and £2.50 for children. A family ticket priced £10 (two adults and two children) is available.
Tickets can be bought via www.TheFA.com/Tickets, by calling 08444 140 754 or in person at the Rotherham United ticket office.
