Walker was first choice for Premier League runners-up Spurs last season making 33 league appearances, but Trippier came to the fore in the latter stages as Walker struggled with injuries.
"I know we both play the same position but it is football and whoever plays, we are always there for each other," Trippier told reporters.
"We always help each other, no matter who we play against, and it will be no different with England.
"I want to play and he wants to play but if he plays, I'll help him. If I get picked, I know he will do the same for me. I believe I can play at this level."
(Reporting by Aditi Prakash in Bengaluru; Editing by Peter Rutherford)
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