Oxlade - Chamberlain continued until early into the second period .
Was in evident discomfort , limping through until the 50th minute , when Oxlade - Chamberlain made way for Theo Walcott .
Oxlade - Chamberlain continued until early into the second period but was in evident discomfort , limping through until the 50th minute , when he made way for Theo Walcott .