Manu Tuilagi insists he tackles hard and fair ahead of England's first Test against South Africa But he said: "I knew it was a good tackle and our QC Richard Smith is pretty awesome. I have just got to learn from it and move forward and I am really looking forward to the tour now. Tuilagi said his aim had been to "make a good hit" and drive the player back but admitted that the difference in weight between the two players - Care is around five stones lighter - had made it difficult to control his hit. "Danny is a lot lighter than me and it is quite hard when it is in the heat of battle and it happens really quickly but you have got to adapt to that and be careful," Tuilagi added. You are coached to make a good hit and drive them back. Danny is a lot lighter than me. It happens really quickly. You learn the hard way. I find it sometimes better to learn the hard way and you only learn once. Tuilagi, who has emerged as the key figure at the heart of England's midfield since breaking into the side during last year's World Cup campaign, is also determined to take his game to a new level against the Springboks. Lancaster has outlined the areas he wants the 21 year-old to work on over the next three weeks and Tuilagi, who has scored five tries in just 10 appearances for England, is relishing the challenge. He said he had to "use the space, footwork sometimes, go straight, mix it up. It is all about what the defence is going to do and you take it up from there. I am excited to get out there and hopefully play rugby. I love playing on hard grounds and in sunny, hot weather. South Africa, you have been warned. Meanwhile Scotland have called up Stuart McInally and Alex Dunbar to their summer tour squad after John Barclay suffered a hand injury and with Max Evans still absent. Barclay is expected to make the first Test against Australia on June 5, but Evans is playing for Castres in the Top 14 semi-finals this weekend and does not need to be released under IRB regulations until the following weekend. Scotland head coach Andy Robinson said: "We've called up Stuart as a precaution given a hand injury that John Barclay sustained in training. John should be available for selection for the Test, but we felt it better to ensure we have sufficient back-row options. Alex will meet up with the squad. We've gone for him as we are still liaising with the IRB, French Federation and Castres to have Max Evans join us as soon as possible. McInally, the 21-year-old Edinburgh back-row forward, will will join the tourists in time for their arrival in Newcastle, New South Wales on Saturday, the venue for their sole meeting with the Wallabies. Dunbar, the 22-year-old Glasgow centre, will join up with the party in Sydney on Friday from Tasmania, where he has been visiting family. Scotland also face Fiji and Samoa in the three-match tour.