Leigh Griffiths admits he will have to prove himself to the new Celtic manager next season, despite being named PFA Scotland footballer of the year.And the Hoops striker plans to bulk up in an effort to nail down a regular starting berth in Scotland manager Gordon Strachans international line-up. Tuesday marks the 30th anniversary of Hearts losing the league title at Dens Park Celtic are looking for their third boss in just over two years after Ronny Deila revealed last month that he will not be in charge of the five-in-a-row champions after the summer. Despite scoring 39 goals in all competitions this season, the former Hibernian and Wolves striker says there are a number of aspects he can still improve on.Speaking from the Hoops Lennoxtown training complex, where he showed off the trophy he picked up at a ceremony in Glasgow on Sunday, he said: This is the main one.For a professional footballer, you are playing against teams week in and week out and for them to vote you the best player in the country is special. Ronny Deilla calling time on Hoops this summer after two years at Celtic Park But you can always improve, you cant just rest on what you have been doing so far. Next season I will be looking to improve my game, I will be stronger, more physical, trying to hold defenders off, and keep scoring goals.The fitness guys give you a programme to work on. We are not going to get a lot of time off, especially with the Scotland games coming up as well. But for the time Im going to get off, I will be in the gym a lot. I will be going out running and Ill be coming back fit.Everyone at the club will have a clean slate. The new manager coming in will have players who are in favour and players who wont be in favour. Its just up to them to work their way back into the squad. Griffiths (on floor) celebrates goal No 39 of the campaign in win over Hearts Ive had a good season so far but the new manager coming in will have his own idea and hopefully I will be part of that plan.And Griffiths, who has been capped seven times by Scotland, believes he has to increase his upper body strength in order to wrest the No 9 jersey from Sunderlands Steven Fletcher and Chris Martin of Derby.I have to because Im not the tallest, he said. Ive got a good spring on me, but Im not like Fletcher or Chris Martin who have got a bit of height about them. Gordon Strachan gave Griffiths Scotland debut against Croatia Im a small guy who will put himself about but Ive not got that height so I need to be stronger and hold defenders off.Griffiths received his award from Strachan but admits he resisted the temptation to lobby the national coach for a start in the forthcoming friendlies against Italy and France.I did that a couple of years ago when I won the sports writers award, added Griffiths, who only played 15 minutes of Scotlands failed Euro 2016 qualifying campaign. He was a guest at the top table and I managed to win that award and I gave him a little bit for not picking me beforehand. And I managed to get my debut a couple of weeks later when we played Croatia.But Im just happy to be back in the squad now, and if I can get a start Ill be buzzing, and if not Ill sit on the bench and wait my turn.We have a lot of good strikers that are all vying for than one place. Its a very acute formation with one striker and you have got to be playing well and you have got to be in favour. Hopefully, come June and the World Cup qualifiers, I can be that man.Also See:Celtic videoCeltic fixturesCeltic statsGet £10 free bet!George Brett Jersey Large . -- In one brief spurt, Brazil turned a close game into a rout and proved again it will be a strong World Cup favourite. Cheap Royals Jerseys .ca. Kerry, Just watched the shootout in the Coyotes/Leafs game and I have to ask, why was the James van Riemsdyk goal allowed to count? All of the video replays we were shown on TV were inconclusive about whether the puck had entirely crossed the line or not. http://www.customroyalsjersey.com/ . PETERSBURG, Fla. Authentic Custom Royals Jersey . Murray beat Sam Querrey 7-6 (5), 6-7 (3), 6-1, 6-3 to clinch Britains opening-round victory against the United States on Sunday at Petco Park. "Im proud of the way Im playing just now, because I had to do a lot of work to get back to where I want to be," Murray said after celebrating with his teammates on the red clay court in a temporary stadium in left field of the downtown home of baseballs San Diego Padres. Cheap Royals Jerseys . Hazard cut in from the left and scored with a swerving right-footed shot for ninth goal of the season, which proved to be enough for the victory despite Chelseas forwards again lacking a cutting edge up front.OKLAHOMA CITY -- Kevin Durant says he will sign with the Golden State Warriors . ' ' '