Good question. I was asking the same question about Matic, during the Arsenal game. He may be slow, old, out-of-form, lazy, but not sure how did he manage to forget proper positioning, given that he was good once upon a time, but apparently it's a thing. Plus Matic has had his whole career to turn his skills into instincts, which TFM has not.
I am very surprised by Ole's statement that TFM is a midfield option. Can't see any way how TFM can come into our midfield and do anywhere close to acceptable job.