Transfer Grades: Chelsea, Liverpool and more from the Premier League

Jores Okore – FC Nordsjaelland to Aston Villa (£4m)

What’s the deal? Aston Villa have beaten Chelsea to the signing, the very impressive signing, of Okore. Villa were awful at the back last year and Okore, at just 20, has the potential to be this year’s Benteke.

Is the price right? Could be a bargain. £4m for a 20 year old with 7 international caps and Champions League experience. Less because Danish clubs aren’t rich and he’s a touch raw but he could be incredible value.

Why sign him? None of the three Villa centre backs stood out last year. Ron Vlaar was the best of a bad bunch but perhaps he’ll improve in his second season. It was a chasm like hole next to him though and Villa needed to do something about it to compliment their lively attack.

Why sell him? They fell in to mid table and are a small club so no Champions League money this season.

Will it work? It could be amazing if he settles in quickly.

Grade: A Very good potential, good price, coup, fills a need. Excellent stuff.

Ricky van Wolfswinkel – Sporting Lisbon to Norwich (£8.5m)

What’s the deal? Norwich smash their club record to get a striker they badly needed.

Is the price right? It’s maybe slightly on the high side considering Sporting Lisbon are lacking money but then when do strikers come cheap? It’s also a good sign of ambition on Norwich’s part.

Why sign him? Norwich had one of the worst attacks in the league last season and missed a lot of chances. They’ve got nice wide men, especially Robert Snodgrass, who create chances but they need someone to put them in the net. He also has pace to compliment his finishing so is more complete than any of Norwich’s current options.

Why sell him? They need the money and can replace him cheaply. Sporting aren’t anywhere near Porto and Benfica so they’re selling out of the title race.

Grade: B+ Van Wolfswinkel is a good player and is an upgrade. He’s going to need to be trusted though as he may go up and down in form.

Modibo Diakite – Lazio to Sunderland (Free)

What’s the deal? Diakite is a big physical defender who lost his place at Lazio after a tactical reshuffle. They beat Juventus and Napoli to the punch.

Is the price right? Free is always good.

Why sign him? Sunderland need a full overhaul of the squad. Although defence isn’t necessarily the priority they could stand to upgrade on Cuellar. He brings height and pace to a defence that is otherwise one dimensional.

Why sell him? Lazio have changed tactics under their new manager which relies on defensive intelligence rather than physicality.

Grade: B He’s going to be rusty having played just once in the 2012/13 season and can make mistakes but he does give Sunderland a different option for free.