I don't have a big opinion on it in all honesty, it could be raised to a 40, with a medium defence arrow, on another note I don't think he's really worthy of his current mentality value, at the moment he's on par with Craig Fagan and Mama Sidibe, which isn't really fair to be honest. He isn't as consistently hard working as the aforementioned and I think Jason would go mad if he saw him play and saw him with such a value. I'm actually quite tempted to give him a 79, but considering Torres and Keogh are on an 80(I think their overrated, personally) it would be unfair to have Luke lower.
I'd also lower his attack by one, his positioning isn't all that to be honest, and can make some really stupid runs. I'd also raise his curling, his shots have a really decent amount of curl and is one I'd consider a rather high green value for. I'd also raise his FKA, I remember him taking a couple of free-kicks that just skimmed over the bar, it could probably be around a 69/70 value. I think changes could also be made to his aggression, technique, jump and dribble accuracy.
"If you are first you are first. If you are second, you are nothing" - Bill Shankly.
"I guarantee fourth place" - Rafael Benitez.