He's suffered with a lack of consistency next to him. He's had Jags and Williams rotating next to him and then Martina, Holgate and Kenny all randomly playing on the right side. It's hard to build up a level of form as a new player with a shifting defence. He's also had to play in a 3 and a 4. I think every single defender deserves a little bit of slack right now but Keane maybe moreso than anyone else.
It's hard to imagine, but maybe Funes Mori really would work well next to him? They seems fairly complementary.