I wouldn't hold your breath about him being EVER fully fit. He struggled with a 'mystery ailment' whilst with Plymouth, and they couldn't use him for most of his loan there (lucky them).
He's played 90 a few times in pre season for us, as our pre season games are usually a reserve side with 4 or 5 first team players with the rest injured. He scored twice once, but did fuck all any other times. I'd say he played about 8 pre season games with us over the last 2 years, and a 3 minute spell against Sunderland last December.
Frankly Yakubu, Jo, Saha, Anichebe, Vaughan are clearly far better players. And last season when ALL of our strikers were injured except Jutkieiwcz and 16 year olds, Moyes played Cahill and fellaini up front rather than play Lucas. We actually played 4-6-0 rather than play him, he has no future here and will be released in July unless we can convince someone to take him before then.
He wouldn't cost Motherwell anywhere near £1 million now, we'd probably give him for free just to be rid of him off the wage bill.