It’s gameweek 25 and we’re well into the second half of the season now…There were some shocks in the defences of many Fantasy Premier League teams during the midweek fixtures just passed, as the likes of John Stones, Per Mertesacker and more importantly Aleksander Kolarov all didn’t feature for their respective sides.If you have one of these three defenders you may be unsure whether to replace them or not. You may also be scouring the market to see if there are more reliable alternatives available.Well all the answers you need are available here – as well as plenty of extra advice to help other areas of your team this week.Check out the Fantasy Premier League transfers you might need to make this week by clicking the right arrow above… 12 Out: Romelu Lukaku (Everton) – £8.9m – Click the right arrow for more advice – Lukaku has now gone five without a goal and, like John Stones, has got a blank gameweek on the horizon in two gameweeks time. Out: Aleksandar Kolarov (Man City): £6.1m – Click the right arrow for more advice – Manchester City have kept three clean sheets in their last four matches, however, Aleksander Kolarov has picked up none of the points! Citys Serbian left back suffered a minor injury a month ago and has since been in and out of the team rotating with Gael Clichy. 12 12 12 12 12 In: Nacho Monreal (Arsenal) – £5.9m – Click the right arrow for more advice – And you dont have to look far to find Mertesackers ideal replacement either. Nacho Monreal has played 90 minutes in all but one of Arsenals matches so far this season! Out: Yaya Toure (Man City) – £8.6m – Click the right arrow for more advice – After he scored three goals in four games back in late December/early January, a fair few people decided to invest in Yaya Toure. It hasnt proved to be a smart move, as since then the Ivory Coast midfielder has not done nearly as much scoring as he has whinging about not winning Africas Player of the Year award. In: Eric Dier (Tottenham) – £5.3m – Click the right arrow for more advice – One solid replacement for John Stones is Spurs Eric Dier. Priced at only £5.3m with fixtures at home to Watford and Swansea coming up, Dier should prove to be more than worth his relatively small fee. In: Jamie Vardy (Leicester) – £7.3m – Click the right arrow for more advice – After going seven without a goal, Jamie Vardy is back and has scored three in his last two. Doubters may say the striker has tough fixtures coming up away at City and Arsenal in the next two weeks however we all know what happens if you chat s*** about Jamie Vardy Out: Per Mertesacker (Arsenal) – £5.3m – Click the right arrow for more advice – Mertesacker was dropped for Arsenals game against Southampton on Tuesday despite having already served the suspension he earned against Chelsea. He is another defender whose long term starting place is now under threat as Gabriel licks his lips at the prospect of filling in. 12 12 12 In: Christian Eriksen (Tottenham) – £8.4m – Click the right arrow for more advice – A far more productive midfielder at the moment is Spurs Christian Eriksen. With two goals and three assists in his last three games, Eriksen has been raking in the points and should be on your fantasy radar without a doubt. In: Nicolas Otamendi/Bacary Sagna (Man City) – £6.5m/£5.8m – Click the right arrow for more advice – If you are looking for a more assured choice in the City defence then Nicolas Otamendi has started every game since November and Bacary Sagna has played 90 minutes in all but one match since October. Although both of their places may be under threat when Kompany and Zabaleta return from injury! 12 Out: John Stones (Everton) – £5.5m – Click the right arrow for more advice – John Stones will miss two of the next three gameweeks as an injury will keep him out of Saturdays game at Stoke, while Liverpool reaching the League Cup final means the Merseyside derby scheduled for 28 February must now be played at a later date. Out: Olivier Giroud (Arsenal) – £9.1m – Click the right arrow for more advice – On some days he looks like a world beater, on other days he looks like a lamp post. Right now hes looking like the latter and is way too inconsistent to have in your teams. 12 12 In: Harry Kane (Tottenham) – £10.1m – Click the right arrow for more advice – Olivier Giroud has no goals in his last three games, but Harry Kane has four goals in his last three games. I believe, if you can afford to stump up the extra £1m, that transfer is known as a no-brainer!