I think he can play there too if he bats a bit more sensibly. The good thing for him is that straight after this series India is going to England. No more stupid ODI/T20 in between. So after 3 test matches here, he would have accustomed to leaving the good balls and playing proper cricket shots only.
I also believe that India should give Yuvraj one last try at Test cricket. He didnt do too badly last time he played. And his confidence would be high after the WC. He did showed immense maturity.
No, JUST NO!!!! There are so many better and more deserving players who have to make their test debuts and Yuvraj should not be anywhere near the test team this year. Pujara must be back for the England series, if Kohli does well, he must be retained for the England series, Rohit Sharma deserves a crack at the tests after his good show in the ODI series, Badrinath deserves to remain in the hunt for that test spot (due to his great showing in domestic first class cricket). So no spot ideally for Yuvraj in tests unless the selectors consider his highly hyped reputation built around ODI and T20 cricket.